Agricultural Reciprocity Between America and China. Agricultural Reciprocity Promoted Through the Canton Christian College, Department of Agricultural Investigation, Education and Practice ... by George Weidman Groff.George Weidman Groff1911EN
The Lychee and Lungan, by George Weidman Groff ... with Eleven Appendices, Including Contributions by Frederick V. Coville, Walter T. Swingle, Edward Goucher, and Michael J. Hagerty, All of the the United States Department of Agriculture. Sixty-eight Illustrations and One Color Plate.George Weidman Groff1921EN