This is the authoritative source for all the artwork and posters of Jules Cheret, who perfected color lithography in the late 1800's. There are a number of color slides of original Jules Cheret posters plus excellent descriptive information to help one identify a suspected Jules Cheret poster. The catalog is by theme or advertiser without an index or table of contents to help one located the exact page where, let's say, Moulin-Rouge or Olympia might start. This does then force scanning to find the start of the catagory one might want - an inconvenience. In spite of this, once you discover the catagory area, the material is informative and precise enough to help with identification.