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Science study aid.

APA Citation

United States. Agricultural Research Service. Information Division. Science study aid. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.].

MLA Citation

United States. Agricultural Research Service. Information Division. Science Study Aid. [Washington: For sale by the Supt. of Docs., U.S. Govt. Print. Off.],

Warning: These citations may not always be complete (especially for serials).