Series consists of a 1908 form letter from the Dairy Students' Union in Hants that has autographs on the reverse, a 1912 letter from the Emigration Branch of the Interior Department of the Government of Canada, a short correspondence in 1922 with Florence Luddington in England about Double Cottenham Cheese, and a 22-page report written in 1930 to the manager of the Powell River Company regarding "The Discoloration of Wood Pulp." Series also includes several undated miscellaneous letters, including a letter from a London art valuer company called Law, Foulsham & Cole, that lists china for sale. The letter is accompanied by five black and white photo prints of the numbered items.

Series consists of Sadler's student notebooks, graduation programs, and draft copies of a newsletter.

Series consists of certificates, musical scores, programs, receipts, and brochures about Sadler's personal life. In addition, the series includes Sadler's elementary school certificates dated 1897 to 1902.

Series consists of publications produced by Macdonald College and the National Conference on Agricultural Services. The series includes two copies of the Old McGill.

Series consists of pamphlets about various topics, including Rules and Objects of the Dairy Students' Union, the Royal Castle of Rosenborg, Macdonald College courses, and the Maple Sugar Industry in Canada.

Series consists of lectures from the UBC Department of Dairying, notes and reference clippings.

The fonds consists of correspondence, lecture notes, reference clippings, student notebooks, programs, newsletters, certificates, musical scores, receipts, pamphlets, and books produced and received by Wilfrid Sadler during his student days at Macdonald College and his professional activities as a professor in the Department of Dairying from 1918. The Department of Dairying was part of the Faculty of Agriculture from 1916 to 1955.