O'Brien, Muriel J. Potato diseases / by Muriel J. O'Brien and Avery E. Rich. - Washington : U.S. Dept. of Agriculture, Agricultural Research Service, 1976. - viii, 79 p. : Ill., col. - Agriculture handbook ; no. 474 . Subjects--Topical Terms: Potatoes--Diseases and pests. LC Class. No.: S21 SB608.P8 / .A37 no. 474 Dewey Class. No.: 630/.8 s 633/.491/9