Portolan chart (English Wikipedia)

Delano-Smith, Catherine (7–8 June 2018). Emergent Maps: Questioning the Rise and Function of the Portolan Chart and the Regional Map in the Middle Ages. Second International Workshop on the Origin and Evolution of Portolan Charts. Lisbon.
Herrera Casais, Mónica. 'The 1413-14 sea chart of Ahmad al-Ţanjī', in: Emilia Calvo, Mercè Comes, Roser Puig & Mónica Rius (eds) A shared legacy: Islamic science East and West. Homage to Prof. J.M. Millàs Vallicrosa (Barcelona: Universitat de Barcelona, 2008) pp.283-307.

adsabs.harvard.edu (Global: 14^th place; English: 9^th place)

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Marelić, Tome (2024-06-01). "Traces of the Common Origin of Carte Pisane, Cortona Chart, and Pietro Vesconte's Charts". KN - Journal of Cartography and Geographic Information. 74 (2): 137–156. Bibcode:2024JCGI...74..137M. doi:10.1007/s42489-023-00154-6. ISSN 2524-4965.
Marelić, Tome (2025-03-01). "Mosaics Within Mosaics: The Geometry of Portolan Atlases that Contradicts the Medieval Origin Hypothesis". KN - Journal of Cartography and Geographic Information. 75 (1): 57–78. Bibcode:2025JCGI...75...57M. doi:10.1007/s42489-024-00176-8. ISSN 2524-4965.
Gaspar, Joaquim Alves (2025-01-02). "The origin of nautical cartography: certitudes, doubts, and perplexities". International Journal of Cartography. 11 (1): 63–92. Bibcode:2025IJCar..11...63G. doi:10.1080/23729333.2023.2240902. ISSN 2372-9333.

bigthink.com (Global: 7,986^th place; English: 5,689^th place)

Jacobs, Frank (10 March 2014). "Portolan Charts 'Too Accurate' to be Medieval". Big Think. Retrieved 30 August 2018.

bimcc.org (Global: low place; English: low place)

Gaspar, Joaquim Alves (2015). "Review of Roel Nicolai's article by Joaquim Alves Gaspar". Maps in History. 53.
Campbell, Tony (2015). "Review of Roel Nicolai's article by Tony Campbell". Maps in History. 53.
Nicolai, Roel (September 2015). "How Old are Portolan Charts Really?". Maps in History 54. The Brussels Map Circle.

books.google.com (Global: 3^rd place; English: 3^rd place)

Leo Bagrow (2010). History of Cartography. Transaction Publishers. p. 65. ISBN 978-1-4128-2518-4.
George Sand (1843). Oeuvres complètes de George Sand. Perrotin. pp. 69–.
Estudos de História, Volume III. UC Biblioteca Geral 1. pp. 10–. GGKEY:7186FCQBHS5.

dart-europe.eu (Global: low place; English: low place)

Nicolai, R. (2014) A critical review of the hypothesis of a medieval origin for portolan charts Archived 2022-06-14 at the Wayback Machine. Uitgeverij Educatieve Media

discovermagazine.com (Global: 3,982^nd place; English: 2,975^th place)

Rehmeyer, Julie. The Mapmaker's Mystery, Discover, June 2014, pp. 44–49 (subscription).

doi.org (Global: 2^nd place; English: 2^nd place)

Marelić, Tome (2024-06-01). "Traces of the Common Origin of Carte Pisane, Cortona Chart, and Pietro Vesconte's Charts". KN - Journal of Cartography and Geographic Information. 74 (2): 137–156. Bibcode:2024JCGI...74..137M. doi:10.1007/s42489-023-00154-6. ISSN 2524-4965.
Marelić, Tome (2024-12-18). "Are Portolan Charts and Portolan Mile Geometrically Rooted in Classical Antiquity? A Cartometric Analysis of al-Shirazi's "Greek Map" and the Pisane, Lucca, Avignon, and Cortona Charts". Cartographica. 59 (4): 143–160. doi:10.3138/cart-2024-0029. ISSN 0317-7173.
Marelić, Tome (2024). "Copying-lineages of portolan chart metrics and implications of their pre-medieval origin". International Journal of Cartography. 0: 1–26. doi:10.1080/23729333.2024.2349974. ISSN 2372-9333.
Marelić, Tome (2025-03-01). "Mosaics Within Mosaics: The Geometry of Portolan Atlases that Contradicts the Medieval Origin Hypothesis". KN - Journal of Cartography and Geographic Information. 75 (1): 57–78. Bibcode:2025JCGI...75...57M. doi:10.1007/s42489-024-00176-8. ISSN 2524-4965.
Nicolai, Roel. "The Premedieval Origin of Portolan Charts: New Geodetic Evidence". Isis. 106 (3): 535–536. doi:10.1086/683532. ISSN 0021-1753.
Gaspar, Joaquim Alves (2025-01-02). "The origin of nautical cartography: certitudes, doubts, and perplexities". International Journal of Cartography. 11 (1): 63–92. Bibcode:2025IJCar..11...63G. doi:10.1080/23729333.2023.2240902. ISSN 2372-9333.
Nicolai, Roel (2024). "The origin problem of nautical cartography: the importance of evidence and method". International Journal of Cartography. 0: 1–25. doi:10.1080/23729333.2024.2352822. ISSN 2372-9333.

hakluyt.com (Global: low place; English: low place)

Campbell, Tony; Barritt, M.K. (December 2020). "The Representation of Navigational Hazards: The Development of Toponymy and Symbology on Portolan Charts from the 13th Century onwards" (PDF). The Journal of the Hakluyt Society: 2.
Campbell, Tony; Barritt, M.K. (December 2020). "The Representation of Navigational Hazards: The Development of Toponymy and Symbology on Portolan Charts from the 13th Century onwards" (PDF). The Journal of the Hakluyt Society: 7.

jstor.org (Global: 23^rd place; English: 15^th place)

Sheehan, Kevin E. (2013). "Aesthetic Cartography: The Cultural Function of Portolan Charts from 1300 to 1700". Imago Mundi. 65 (1): 133.
Houssaye Michienzi, Ingrid; Vagnon, Emmanuelle (2019). "Commissioning and Use of Charts Made in Majorca c. 1400: New Evidence from a Tuscan Merchant's Archive". Imago Mundi. 71 (1): 27–28.
Houssaye Michienzi, Ingrid; Vagnon, Emmanuelle (2019). "Commissioning and Use of Charts Made in Majorca c. 1400: New Evidence from a Tuscan Merchant's Archive". Imago Mundi. 71 (1): 22.

lecfc.fr (Global: low place; English: low place)

Gaspar, Joaquim Alves (June 2013). "From the Portolan Chart to the Latitude Chart: The silent cartographic revolution" (PDF). CFC (216): 67–77.
Ducène, Jean-Charles (2013-06-01). "Le portulan arabe décrit par Al-'Umari" (PDF). CFC (216): 81–90.

maphistory.info (Global: low place; English: low place)

Campbell, Tony. "'Portolan charts from the late thirteenth century to 1500' (Additions, Corrections, Updates)". Map History / History of Cartography: THE Gateway to the Subject. Retrieved 8 December 2018.
Campbell, Tony (18 November 2016). "Cartographic innovations by the early portolan chartmakers". Map History / History of Cartography: THE Gateway to the Subject. Retrieved 8 December 2018.
Campbell, Tony (2021). "Mediterranean portolan charts: their origin in the mental maps of medieval sailors, their function and their early development". Retrieved 6 October 2021.

sciencedirect.com (Global: 137^th place; English: 146^th place)

Sutlović, Julijan (September 2025). "Signs Related to the Safety of Navigation on Late Medieval and Early Modern Nautical Charts of the Adriatic Sea, circa 1270 - 1824". Journal of Historical Geography. 89: 35.
Sutlović, Julijan (September 2025). "Signs Related to the Safety of Navigation on Late Medieval and Early Modern Nautical Charts of the Adriatic Sea, circa 1270 - 1824". Journal of Historical Geography. 89: 36.
Sutlović, Julijan (September 2025). "Signs Related to the Safety of Navigation on Late Medieval and Early Modern Nautical Charts of the Adriatic Sea, circa 1270 - 1824". Journal of Historical Geography. 89: 31.
Sutlović, Julijan (September 2025). "Signs Related to the Safety of Navigation on Late Medieval and Early Modern Nautical Charts of the Adriatic Sea, circa 1270 - 1824". Journal of Historical Geography. 89: 31–32.
Sutlović, Julijan (September 2025). "Signs Related to the Safety of Navigation on Late Medieval and Early Modern Nautical Charts of the Adriatic Sea, circa 1270 - 1824". Journal of Historical Geography. 89: 32.

umd.edu (Global: 1,356^th place; English: 1,172^nd place)

api.drum.lib.umd.edu

Clawson, Mary G. "The Evolution of Symbols on Nautical Charts Prior to 1800." Master's thesis, University of Maryland, 1979. p. 24.
Clawson, Mary G. "The Evolution of Symbols on Nautical Charts Prior to 1800." Master's thesis, University of Maryland, 1979. p. 27.

utppublishing.com (Global: low place; English: low place)

Marelić, Tome (2024-12-18). "Are Portolan Charts and Portolan Mile Geometrically Rooted in Classical Antiquity? A Cartometric Analysis of al-Shirazi's "Greek Map" and the Pisane, Lucca, Avignon, and Cortona Charts". Cartographica. 59 (4): 143–160. doi:10.3138/cart-2024-0029. ISSN 0317-7173.

web.archive.org (Global: 1^st place; English: 1^st place)

Nicolai, R. (2014) A critical review of the hypothesis of a medieval origin for portolan charts Archived 2022-06-14 at the Wayback Machine. Uitgeverij Educatieve Media

worldcat.org (Global: 4^th place; English: 4^th place)

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Roel, Nicolai (2016). The enigma of the origin of Portolan charts : a geodetic analysis of the hypothesis of a medieval origin. Leiden. pp. 11–12. ISBN 9789004282971. OCLC 932069190.{{cite book}}: CS1 maint: location missing publisher (link)
Marelić, Tome (2024-06-01). "Traces of the Common Origin of Carte Pisane, Cortona Chart, and Pietro Vesconte's Charts". KN - Journal of Cartography and Geographic Information. 74 (2): 137–156. Bibcode:2024JCGI...74..137M. doi:10.1007/s42489-023-00154-6. ISSN 2524-4965.
Marelić, Tome (2024-12-18). "Are Portolan Charts and Portolan Mile Geometrically Rooted in Classical Antiquity? A Cartometric Analysis of al-Shirazi's "Greek Map" and the Pisane, Lucca, Avignon, and Cortona Charts". Cartographica. 59 (4): 143–160. doi:10.3138/cart-2024-0029. ISSN 0317-7173.
Marelić, Tome (2024). "Copying-lineages of portolan chart metrics and implications of their pre-medieval origin". International Journal of Cartography. 0: 1–26. doi:10.1080/23729333.2024.2349974. ISSN 2372-9333.
Marelić, Tome (2025-03-01). "Mosaics Within Mosaics: The Geometry of Portolan Atlases that Contradicts the Medieval Origin Hypothesis". KN - Journal of Cartography and Geographic Information. 75 (1): 57–78. Bibcode:2025JCGI...75...57M. doi:10.1007/s42489-024-00176-8. ISSN 2524-4965.
Nicolai, Roel. "The Premedieval Origin of Portolan Charts: New Geodetic Evidence". Isis. 106 (3): 535–536. doi:10.1086/683532. ISSN 0021-1753.
Gaspar, Joaquim Alves (2025-01-02). "The origin of nautical cartography: certitudes, doubts, and perplexities". International Journal of Cartography. 11 (1): 63–92. Bibcode:2025IJCar..11...63G. doi:10.1080/23729333.2023.2240902. ISSN 2372-9333.
Nicolai, Roel (2024). "The origin problem of nautical cartography: the importance of evidence and method". International Journal of Cartography. 0: 1–25. doi:10.1080/23729333.2024.2352822. ISSN 2372-9333.

Portolan chart (English Wikipedia)

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