René Dagron (Catalan Wikipedia)

Analysis of information sources in references of the Wikipedia article "René Dagron" in Catalan language version.

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1cyberdriveillinois.com

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1microscopy-uk.org.uk

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1web.archive.org

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archive.org

Josef Maria Eder; Hinricus Lüppo-Cramer History of Photography. Columbia University Press, 1945, p. 388.

cix.co.uk

The Pigeon Post into Paris 1870–1871 by J.D. Hayhurst O.B.E. Prepared in digital format by Mark HayhurstmCopyright ©1970 John Hayhurst Arxivat 2016-06-08 a Wayback Machine. Quote: "He now proposed to Rampont that his process should be applied to pigeon messages and a contract was concluded on 11th November.

cyberdriveillinois.com

Newsletter of the Illinois State Archives & The Illinois State Historical Records Advisory Board Jesse White Secretary of State & State Archivist Volume 21 Number 1 Quote: "Despite Dancer’s early work, in 1859, Rene Dagron, a French optician, received the first patent for microfilm.

google.cat

books.google.cat

Section française, catalogue officiel: catalogue officiel p. 99 By International exhibition, 1862 Published by Impr. impriale, 1862 Original from Oxford University Digitized 8 Jun 2006 882 pages
Josef Maria Eder; Hinricus Lüppo-Cramer History of Photography. Columbia University Press, 1945.
The Focal Encyclopedia of Photography: Digital Imaging, Theory and Applications, History, and Science p. 94 By Michael R. Peres Contributor Michael R. Peres Published by Focal Press, 2007 ISBN 978-0-240-80740-9

loc.gov

blogs.loc.gov

caught-our-eyes-on-the-head-of-a-pin/
Kristi Finefield (June 13th, 2012), "Caught Our Eyes: On the Head of a Pin", Picture This: Library of Congress Prints and Photos

microscopy-uk.org.uk

Pigeon's post

ucla.edu

srlf.ucla.edu

CHRONOLOGY OF MICROFILM DEVELOPMENTS 1800 – 1900 from UCLA
RENE DAGRON from UCLA Quote: "On June 21, 1859, Dagron received the first microfilm patent ever granted"
^{[enllaç sense format]} http://www.srlf.ucla.edu/exhibit/text/hist_page3.htm

web.archive.org

The Pigeon Post into Paris 1870–1871 by J.D. Hayhurst O.B.E. Prepared in digital format by Mark HayhurstmCopyright ©1970 John Hayhurst Arxivat 2016-06-08 a Wayback Machine. Quote: "He now proposed to Rampont that his process should be applied to pigeon messages and a contract was concluded on 11th November.