Spores from the Herrin (no. 6) coal bed in Illinois
By: by James M. Schopf
Series: Illinois. State Geological Survey. Report of investigations -- no. 50
Publisher: Printed by authority of the State of Illinois
Published: 1938
Place of publication: Urbana, Ill
Language: eng
Number of pages: 73
Subjects: Coal; Paleobotany
Notes: Bibliography: p. 53-55.