I am trying to find out information about photography studios from Frederick County, Maryland and the surrounding areas. Looking for when the studios were in business. I am trying to date old photographs from: W.C.Bell (Frederick, Maryland), Edmonston Studio (Washington), Rogers Studio (Frederick, Maryland),Tenschert Studio (Washington, D.C.), Rogers Studio (Frederick Thurmont, M.D.), Fellows-Rogers (Frederick, Maryland), and Donaldson (Washington, D.C.). I haven't been able to find out any information about the studios.
Any help is greatly appreciated!