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|Material Type:||Government publication, State or province government publication|
|All Authors / Contributors:||
E H Mathewson; United States. Department of Agriculture.; United States. Bureau of Plant Industry.
|Description:||67 pages illustrations, tables 23 cm.|
|Series Title:||Bulletin (United States. Bureau of Plant Industry), no. 268.|
|Responsibility:||By E.H. Mathewson.|