The incubation of hen's eggs
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書誌事項
The incubation of hen's eggs
（Extension bulletin / Purdue University Department of Agricultural Extension, no. 101）
Purdue University, 1925
2nd rev. ed
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注記
Cover title
The incubation of hen's eggs
（Extension bulletin / Purdue University Department of Agricultural Extension, no. 101）
Purdue University, 1925
2nd rev. ed
Cover title