Read, Charles B. 1907-1979
Upper paleozoic floral zones and floral provinces of the United States / by Charles B. Read and Sergius H. Mamay. -- Washington : United States Government Printing Office, 1964 - 35 p., [19] h. de lam. -- (Geological Survey Professional Paper ; 454-K).
Estados Unidos
Paleobotánica
561(73)
Upper paleozoic floral zones and floral provinces of the United States / by Charles B. Read and Sergius H. Mamay. -- Washington : United States Government Printing Office, 1964 - 35 p., [19] h. de lam. -- (Geological Survey Professional Paper ; 454-K).
Estados Unidos
Paleobotánica
561(73)