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註釋1 letter book containing copies of 3 letters, one to the Under Secretary for Agriculture, concerning Farrer's experiments in soil-management. Also some MS notes of experimental data. Also includes 1 letter book - typescript copies of letters of William Farrer written from Lambrigg, Queanbeyan and Tharwa, N.S.W., to Dr B.T. Galloway and Mr. M.A. Carleton of the U.S. Dept. of Agriculture, 1894-1906.