The Genealogue mentioned an article from the A.P. about color photos in the Library of Congress’ holdings, from the Depression in 1930s-era USA, as well as World Ward II. Besides those color photographs, there are two more collections (including one held by the Library of Congress as well) that maybe of interest to many genealogists (at least from a historical curiosity point of view), one documenting World War I, the other covering the Russian Empire from 1909 – 1915.
Historical
News of Historical Interest