Richards, Herbert Maule,  1871-1928 <br/><br/>
Acidity and gas interchange in cacti / 
by H. M. Richards. 
 - Washington, D.C. :  Carnegie Institution of Washington,  1915. 
 - 1 p. l., 107 p. :  incl. diagrs., tables. ;  26 cm. 
 - Carnegie Institution of Washington publication ;  no. 209 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cactus.<br/>Plant physiology
<br/><br/><label>Dewey Class. No.: </label>581.1 RIC