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By "Pickering, Spencer U., 1858-1920"
Fruit trees and their natural enemies : with a spraying calendar / by Spencer U. Pickering and Fred. V. Theobald.
By: Pickering, Spencer U., - Theobald, Fred. V. (Frederick Vincent),
Publication info: London :Simpkin, Marshall, Hamilton, Kent,1908.
Holding Institution: NCSU Libraries (archive.org)