Riehl, Jerry A. <br/><br/>
Development Of a strategy for sampling tree rings / 
by Jerry A. Riehl 
 - WAshington :  United States Environmental Protection Agency,  1979 
 - 39 p. ;  28 cm. 
<br/><br/> EPA-600/3-79-030 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crops--Physiology<br/>Plant physiology--United States
<br/><br/><label>Dewey Class. No.: </label>571.2