المؤلفون: Terrell, Edward E.
الإتاحة: https://www.biodiversitylibrary.org/item/139504
المؤلفون: Harmon, Frank Nelson, 1895-
الإتاحة: https://www.biodiversitylibrary.org/item/132175
المؤلفون: United States. Agricultural Research Service. Crops Research Division.
الإتاحة: https://www.biodiversitylibrary.org/item/132160
الإتاحة: https://www.biodiversitylibrary.org/item/132074
المؤلفون: United States. Plant Pest Control Division.
المساهمون: United States. Agricultural Research Service.
الإتاحة: https://www.biodiversitylibrary.org/item/199870