Guennel, Gottfried Kurt,  1920- <br/><br/>
Fossil spores of the Alleghenian coals in Indiana. 

 - Bloomington,  1952. 
 - 40 p.  illus. 
<br/><br/>"References": p. 40. 
<br/><br/><label>LCCN: </label>gs 53000090  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleobotany--Indiana.<br/>Plant spores, Fossil--Indiana<br/>Coal--Indiana.
<br/><br/><label>LC Class. No.: </label>QE109  / .A3 no. 4