I also collect photographs. I use the woman's dress to date the photograph. I have two little pamphlets. The first is "How to... Date Women's Clothing: 1800-1899" published by the Association of Illinois Musuems and Historical Societies July, 1993 #3. The second is "How to...Date Women's Clothing: 1900-1930" published by The Congress of Illinois Historical Societies and Museums, April, 1993 #2 Both say multiple copies are available for two dollars each from the Illinois State Historical Society, CIHSM Coordinator, Old State Capitol, Springfield, IL 62701 Marjorie Smith