Averitt, Paul 1908-1991
Stripping-Coa Resources f the United States, jaunary1, 1970 / By Paul Averitt. -- Washington : United States Governement printing Office, 1970 - 34 p. -- (Geological Survey Bulletin ; 1322).
Fecha real de registro 15-03-1971
Carbón
553.9
Stripping-Coa Resources f the United States, jaunary1, 1970 / By Paul Averitt. -- Washington : United States Governement printing Office, 1970 - 34 p. -- (Geological Survey Bulletin ; 1322).
Fecha real de registro 15-03-1971
Carbón
553.9