Hulha (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hulha" in Portuguese language version.

refsWebsite

Global rank Portuguese rank

4web.archive.org

1^st place

3books.google.com

3^rd place

6^th place

1harvard.edu

18^th place

51^st place

1doi.org

2^nd place

4^th place

1jstor.org

26^th place

65^th place

1questia.com

1,201^st place

1,547^th place

1doe.gov

2,463^rd place

1,900^th place

1uwyo.edu

low place

1state.co.us

7,916^th place

low place

1gov.bc.ca

2,476^th place

6,280^th place

1gov.ab.ca

low place

1eh.net

9,448^th place

8,499^th place

books.google.com

Richards, William Allyn (1915), «Forging of iron and steel», D. Van Nostrand Company, Nature, 97 (2419): 50, Bibcode:1916Natur..97...30H, doi:10.1038/097030b0.
Freese, Barbara (2004). Coal: A Human History. [S.l.]: Basic Books. ISBN 978-0-465-09618-3
Wadleigh, Francis Rawle (1921), A coal manual for salesmen, buyers and users, National coal mining news, p. 113.

doe.gov

eia.doe.gov

«Types of Coal». eia.doe.gov (U.S. Energy Information Administration). Consultado em 4 de janeiro de 2011

doi.org

dx.doi.org

Richards, William Allyn (1915), «Forging of iron and steel», D. Van Nostrand Company, Nature, 97 (2419): 50, Bibcode:1916Natur..97...30H, doi:10.1038/097030b0.

eh.net

Adams, Sean Patrick, . "The US Coal Industry in the Nineteenth Century." EH.Net Encyclopedia, August 15, 2001 scholarly overview

gov.ab.ca

ags.gov.ab.ca

Canadian Society of Petroleum Geologists (1994). «The Geological Atlas of the Western Canada Sedimentary Basin, Chapter 33: Coal Resources of the Western Canada Sedimentary Basin». Compiled by Mossop, G.D. and Shetsen, I. Consultado em 1 de agosto de 2013. Cópia arquivada em 30 de setembro de 2013

gov.bc.ca

empr.gov.bc.ca

Ryan, Barry (2002). «Coal in British Columbia». Consultado em 24 de janeiro de 2014. Cópia arquivada em 2 de fevereiro de 2014

harvard.edu

ui.adsabs.harvard.edu

Richards, William Allyn (1915), «Forging of iron and steel», D. Van Nostrand Company, Nature, 97 (2419): 50, Bibcode:1916Natur..97...30H, doi:10.1038/097030b0.

jstor.org

Veenstra, Theodore A., and Wilbert G. Fritz. "Major Economic Tendencies in the Bituminous Coal Industry," Quarterly Journal of Economics 51#1 (1936) pp. 106–130 in JSTOR

questia.com

Netschert, Bruce C. and Sam H. Schurr, Energy in the American Economy, 1850–1975: An Economic Study of Its History and Prospects. (1960) online

state.co.us

geosurvey.state.co.us

«Colorado Coal: Energy security for the future» (PDF). Colorado Geological Survey, Rock Talk, vol. 8, no. 2, pp. 1–12. 2005. Consultado em 24 de janeiro de 2014. Cópia arquivada (PDF) em 1 de fevereiro de 2014

uwyo.edu

wsgs.uwyo.edu

Wyoming State Geological Survey. «Wyoming Coal». Consultado em 24 de janeiro de 2014. Cópia arquivada em 3 de fevereiro de 2014

web.archive.org

Wyoming State Geological Survey. «Wyoming Coal». Consultado em 24 de janeiro de 2014. Cópia arquivada em 3 de fevereiro de 2014
«Colorado Coal: Energy security for the future» (PDF). Colorado Geological Survey, Rock Talk, vol. 8, no. 2, pp. 1–12. 2005. Consultado em 24 de janeiro de 2014. Cópia arquivada (PDF) em 1 de fevereiro de 2014
Ryan, Barry (2002). «Coal in British Columbia». Consultado em 24 de janeiro de 2014. Cópia arquivada em 2 de fevereiro de 2014
Canadian Society of Petroleum Geologists (1994). «The Geological Atlas of the Western Canada Sedimentary Basin, Chapter 33: Coal Resources of the Western Canada Sedimentary Basin». Compiled by Mossop, G.D. and Shetsen, I. Consultado em 1 de agosto de 2013. Cópia arquivada em 30 de setembro de 2013