Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.n.
Citazione stile Chigago Style (17a edizione)Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.l: s.n.
Citatione MLA (9a ed.)Iowa. State College of Agriculture and Mechanic, Atrs, Ames. Statistical Laboratory. Report. s.n.
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