Quaintance, A. L The oyster-shell scale and the scurfy scale / by A. L. Quaintance and E. R. Sasscer - Washington : Department of agriculture - 16 p. - EUA. Dept. of Agriculture Farmers'bull.; 723 . LCCN: 203573 Subjects--Topical Terms: Cochinilla Chionaspis furfura Lepidosaphes ulmi.