edited by Benjamin M. Duggar ; with the cooperation of Janet Howell Clark ... [et al.]

Mcgraw-Hill c1936

v. 1 , v. 2

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by B.M. Duggar

Orange Judd , Kegan Paul, Trench, Trübner 1925, c1915

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Benjamin M. Duggar

Macmillan c1911 The rural text-book series

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by B.M. Duggar

Govt. Print. Off. 1905 U.S. Department of Agriculture, Bureau of Plant Industry bulletin no. 85

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