Farm spies; how the boys investigated field crop insects

Wedi'i Gadw mewn:
Manylion Llyfryddiaeth
OCLC:15562962
Prif Awdur: Conradi, Albert F. (Albert Frederick), 1877-
Awduron Eraill: Thomas, William Andrew, 1883-
Iaith:English
Cyhoeddwyd: New York, The Macmillan Company, 1916.
Pynciau:
Beneficial insects > Textbooks.
Insect pests > Textbooks.
Agricultural pests > Textbooks.
Agriculture > Textbooks.
Fformat:

Monograph

Note that CRL will digitize material from the collection when copyright allows.

Tabl Cynhwysion:
  • The boll-weevil
  • The black bill-bug of corn
  • When corn is fox-eared
  • The black corn-weevil
  • Grasshoppers
  • Chinch-bugs
  • The cotton root-louse
  • Windfalls of corn.

Eitemau Tebyg