The digital collection The Walter Koessler Project is a blog created by Dean Putney presenting a selection from the thousand photographs taken privately during the First World War by his great-grandfather Walter Koessler, a German officer. His photographs show many sides of the German army, including training and aircraft. Koessler himself made aerial photographs, too. Among the photographs yet to be digitized are hundred stereoscopic images. After the First World War Koessler became an architect in Los Angeles. Thanks to crowdfunding his great-grandson could publish the large format book Walter Koessler 1914-1918: The personal photo journal of a German officer in World War I with some of the aerial photographs.