1979 annual technical report of the national plant materials center :  a summary of the activities of calendar year 1979 / 
United States Department of Agriculture 
 - Washington, D. C. :  The Department,  1980 
 - ii, 124 p. ;  28 cm. 
<br/><br/> Soil conservation service 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--United States--Research<br/>Agricultural extension work--United States
<br/><br/><label>Dewey Class. No.: </label>630.72073