The site of the fair is part of the Fairmont Park in Philadelphia--their are still some of the reflecting pools, a few pieces of statuary, and of course, Memorial Hall. I believe that Memorial Hall has a collection of photos from the Exposition, as well as a detailed map of the grounds. I can't think where, but I have read numerous accounts of the exhibits, so there is a lot of information around. You should contact the Fairmont Park Commission--there are a number of restored colonial mansions in the park, an there is a good sized staff of curators and historians. Some of the park is a national park as well, and, the Free Library of Philadelphia(which is on the Parkway) has a collection related to the Exposition as well. If memory serves me, through a clever ruse, Susan B. Anthony read the Declaration of Women's Rights at the opening ceremonies of the Fair--