Pteridosperm male fructifications
Subtitle: American species of Dolerotheca, with notes regarding certain allied forms.
Series: Illinois.  State Geological Survey.  Report of investigations,; no. 142
Publisher: Illinois State Geological Survey
Published: 1949
Place of publication: Urbana
Language: eng
Number of pages: 724
Subjects: Dolerotheca.
Notes: "References": p. 723-724.
"Reprinted from the Journal of paleontology, vol. 22, no. 6, November, 1948."