Hurd, Paul DeHart, 1905-  Hurd, Paul DeHart, 1905- <br/><br/>
Biological education in American secondary schools, 1890-1960. 

 - Washington,  American Institute of Biological Sciences  [1961] 
 - American Institute of Biological Sciences. Biological Sciences Curriculum Study. Bulletin  no. 1 .
 - Biological Sciences Curriculum Study bulletin ;  no. 1. .
<br/><br/>Includes bibliographies. 
<br/><br/><label>LCCN: </label>61011432 //r85 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology -- Study and teaching (Secondary) -- United States.--Biology -- Study and teaching (Secondary) -- United States.--Biology -- Study and teaching (Secondary) -- United States.
<br/><br/><label>LC Class. No.: </label>QH315  / .H87 
<br/><br/><label>Dewey Class. No.: </label>574.071273