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Unseen World War I photos

By Dean Putney
The following photos were taken from 1914-1918 by my great-grandfather Lt. Walter Koessler during his time as a German officer in the first World War. They're part of a collection of over a thousand photos, stereographs and their negatives that my family has been saving for a century. This is an unusually large and complete collection, and I've taken on the task of preserving it and printing it so other people can experience this history too.