Greetings,  I have a listing of Duo-Art rolls (also Welte and Ampico)
on my web site on this page:
http://www.spencerserolls.com/Download.html

I am interested in adding any rolls not on this list, including the
undocumented Audiographic rolls.  This list will be updated and included
in the master database being compiled by Warren Trachtman which will
serve as a resource for all interested parties, including those who
are scanning rolls and who need the information for inclusion in their
files.  We are hoping that all of this information will only have to be
entered once to make it available to everyone.

I have done a lot of work compiling my lists which were merged from
several sources.  Any corrections and or additions are welcome.

Best regards,
Spencer Chase
Laytonville, Calif.
http://www.spencerserolls.com/