Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 97
Eight-year-old White Pines and 6-year-old Maples, planted Spring of 1903. Pines 3 years old, Maples i year old. Seven-year-old White Pines, planted in Grass Land, August, 1905. Four years old. Nine-year-old White Pines, planted in Pasture Land, Spring of 1902. Three years old.
Engineering
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
