O'Brien, Muriel. Potato diseases - Washington : Department of Agriculture, 1976 - 79 p. : ilus. - Agriculture handbook ; 474 . - Agriculture handbook ; 474 . LCCN: 33511 Subjects--Topical Terms: Papa--Enfermedades por virus.Papas--Enfermedades Dewey Class. No.: 635.21 / O2