Nelson, Willis H. 1920-2010
Geology of the Duck creek pass Quadrangle Montana / by Willis H. Nelson. -- Washington : United States Government Printing Office, 1963 - 56 p. + map. -- (Geological Survey Bulletin ; 1121-J).
Geología
Montana
55(786)
Geology of the Duck creek pass Quadrangle Montana / by Willis H. Nelson. -- Washington : United States Government Printing Office, 1963 - 56 p. + map. -- (Geological Survey Bulletin ; 1121-J).
Geología
Montana
55(786)