MURPHY, T. D.
Distribution of Silica resources in Eastern United States / by T. D. Murphy. -- Washington : United States Government Printing Office, 1960 - P. 657-665 + map. -- (Geological Survey Bulletin ; 1072-L).
Estados Unidos
Rocas silíceas
552.55(73)
Distribution of Silica resources in Eastern United States / by T. D. Murphy. -- Washington : United States Government Printing Office, 1960 - P. 657-665 + map. -- (Geological Survey Bulletin ; 1072-L).
Estados Unidos
Rocas silíceas
552.55(73)