Downing, Elliot Rowland,  b. 1868 <br/><br/>
A source book of biological nature-study / 
by Elliot Rowland Downing 
 - Chicago :  The University of Chicago Press,  [1919] 
 - xxi, 503 p. :  ill. ;  23 cm. 
 - The University of Chicago nature-study series, ed. by E.R. Downing .
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural history--Study and teaching<br/>Nature study
<br/><br/><label>Dewey Class. No.: </label>574.907