Schopf, James Morton,  1911- <br/><br/>
Contributions to Pennsylvanian paleobotany Mazocarpon oedipternum,  sp. nov. and Sigillarian relationships, 
by James M. Schopf ... Printed by authority of the state of Illinois. 
 - Urbana, Ill.,  1941. 
 - 53p.  incl.illus.,6pl.  25cm. 
 - Illinois.  State geological survey.  Report of investigations  no. 75 .
<br/><br/> At head of title: State of Illinois, Dwight H. Green, governor.  Dept. of registration and education, Frank G. Thompson, director.  Division of the State geological survey, M.M. Leighton, chief, Urbana. 
<br/><br/>"References": p.38-40. 
<br/><br/><label>LCCN: </label>gs 42000051  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleobotany--Pennsylvanian.<br/>Mazocarpon.<br/>Paleobotany--Illinois.
<br/><br/><label>LC Class. No.: </label>QE971  / .S3 
<br/><br/><label>Dewey Class. No.: </label>567/.9