Petrik, Aleta <br/><br/>
The Pteriophytes of Kanasas, Nebraska south Dakota and north Dakota 
Aleta Jo Petrik Ott 
 - 1st ed 
 - Lehre [Germany]  J. Cramer  1979 
 - 332 p., : ill 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science Section
<br/><br/><label>Dewey Class. No.: </label>581.9787 PET