Barker, Fred
Precambrian geology of the needle mountains, Southwestern Colorado / by Fred Barker. -- Washington : United States Government Printing Office, 1969 - 33 p. -- (Geological Survey Professional Paper ; 644-A).
Colorado
Precámbrico
Rocas ígneas
552.3(788)"611"
Precambrian geology of the needle mountains, Southwestern Colorado / by Fred Barker. -- Washington : United States Government Printing Office, 1969 - 33 p. -- (Geological Survey Professional Paper ; 644-A).
Colorado
Precámbrico
Rocas ígneas
552.3(788)"611"