Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Thomas M. Kehn"'
Publikováno v:
Circular.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ac85567ba3da9c7ee074eeeb1fb3fd8
https://doi.org/10.3133/cir891
https://doi.org/10.3133/cir891
Publikováno v:
Open-File Report.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3146195f4ee8a0471e13b9b3a9f11ce2
https://doi.org/10.3133/ofr81790
https://doi.org/10.3133/ofr81790
Autor:
Thomas M. Kehn, Gordon H. Wood
Publikováno v:
AAPG Bulletin. 63
In 1976, the U.S. Geological Survey and U.S. Bureau of Mines published a system of coal-resources classification that incorporated definitions and criteria to be used by the two agencies. This system was adopted by many state geological surveys. Howe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97352895253a7374836f13e56b2ec6f6
https://doi.org/10.1306/2f9186f8-16ce-11d7-8645000102c1865d
https://doi.org/10.1306/2f9186f8-16ce-11d7-8645000102c1865d
Publikováno v:
Open-File Report.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::949ef803ad3ca2dc1f26ed146b9026d1
https://doi.org/10.3133/ofr82480
https://doi.org/10.3133/ofr82480