Harold D. Hughes <br/><br/>
Crop production / 
Harold D. Hughes & Darrel S. Metcalfe 
 - 3rd ed 
 - Macmillan Publishing Co  London  1972 
 - xi , 627 p  illus  24 cm 
<br/><br/>Agriculture beginnings (Page-1), World production distribution (Page-10), US production distribution (Page-27), The world food population problem (Page-41), Agricultural production adjustments (Page-57), Climate weather and crops (Page-71), Water use by crops (Page-142), Irrigation ,drainage and dryland farming (Page-156), The soil and croping practices (Page-176), Wheat and rye (Page-352), The soybean crop (Page-370), Potatos (Page-430), Alfalfa (Page-503), Dryland grasses (Page-567), Crop enemies (Page-577), Crop terms (Page-602). 
<br/><br/><label>Subjects--Personal Names: </label><br/>Harold D. Hughes
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop production
<br/><br/><label>Dewey Class. No.: </label>630,HUG