James Blaine Yule studied engineering at the University of Montana. He began working for the US Forest Service in 1911 as a forest ranger and transferred to their division of engineering in 1917. Yule pioneered the development of aerial photography and photogrammetry, both used to speed up forest mapping. He retired in 1947 as the Chief of Maps and Surveys in Region One. This biography was written by his daughter.
Jamie B. Yule
Biography of James B. Yule.