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 U. S. Department of Agriculture. 
= Yearbook of agriculture 1930. 
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Milton S. Eisenhower, Editor, Arthur 
P. Chew, Ass't Editor. 1080 p., illus. Washington, Govt. Print. Off. 
1930. (No Yearbook bearing the date of 1929 was published. ) 
U. S. Department of Agriculture. Library. | 
Bibliographical contributions No. 20. Check list of publications 
on entomology issued by the United States Department of Agriculture 
through 1927, with subject index. Compiled by Mabel Colcord, Ina L. 
Hawes, and Angelina J. Carabelli, of the Library, Bureau of Entomology. 
261 p. [Mimeographed.] Washington, Govt. Print. Off. January, 1930. 
Niani, Pietro. ; 
: Traviavasaiecrticultura .. ... 4, VOl.. Lllus, 0ataniave cece 
cesco Battiato, 1929. . 
geen. ©. C. A. A. 
De invloed van Pseudococcus citri (Risso) Fern. op de plant 
fmemoillus.. plates. Baarn, 1950. 
moll, W. &. : 
A comparative study of a chalcid egg parasite in 3 species of Plat- 
aspidinae. Lingman Sc. J. v. 6, No. 3, p. 251-239, September, 19233 
Weed, Clarence. 
Insect ways. 325 p., illus. New York, D. Appleton & Co., 19350. 
Meewister, J. C. 
Lilac culture. 123 p., illus. New York, Orange Judd Publishing Co., 
1930. (Insects and disease, p. 78-85.) 
