Some beneficial insects

Bibliographic Details

Main Author:	Thompson, W. R. (William Robin), 1887-
Format:	Book
Language:	English
Published:	London, H.M. Stationery Off., 1939.
Edition:	[4th ed.]
Series:	Bulletin (Great Britain. Ministry of Agriculture, Fisheries and Food) no. 20.
Subjects:	Beneficial insects.