Coal paleobotany
By: by Reinhardt Thiessen and George C. Sprunk.
Contributors: Sprunk, George C, 1905- joint author.
Series: United States. Bureau of mines. Technical paper 631
Publisher: U.S. Govt. print. off.
Published: 1941
Place of publication: Washington
Language: eng
Number of pages: 56
Subjects: Paleobotany -- Carboniferous; Coal
Notes: At head of title: United States Dept. of the interior, Harold L. Ickes, secretary. Bureau of mines, R. R. Sayers, director.
"Presented at annual meeting, Paleobotanical division, American association for advancement of science, Indianapolis, Ind., December 1937."--p. 1.