I recently unburied my head from the sand and saw an article on resources for catalogers of early printed maps. The article is from the Journal of Map & Geography Libraries (JMGL), v.3, no. 2, 2007 and written by Nancy Kandoian. I'm not sure if this has been discussed on the list yet - but the title of the article is: "Cartobibliography for catalogers: reference materials to support the identification of early printed maps." There is a great list of reference materials that aren't only useful for the super early printed maps - but also maps dating into the early 20th Century. It's a great resource for catalogers and I highly recommend it this article. There are a number of other, really interesting looking articles in that issue of JMGL as well - if you have some extra time - it's worth reading. Angie AGSL UWM