Carol Nash wrote:
>I have a question for you re: photography studios of the
>early 20th century.  ...  Is there a 'magic' archive of names and
>dates of operation?


What you need to do is find some poor schmuck with nothing better to do
than compile lists like this:

http://www.rootsweb.com/~nyccazen/MscLists/Photogrphers.html

Now that is a poor soul who needs to get out of the office once in a while!

         Dan W.