Photo-Lab Index ©1974 some more information.
I am attaching some pictures of the Photolab Index. For those APUGers that are not familiar with it you can see it is a HUGE date file. The pages are over THREE INCHES THICK. It has data from all the major and most of the minor manufacturers of photographic materials. It also has sections that with manufacturer's supplied information on how to use the various photographic materials and chemicals.
It has more information about films, papers and photo-chemicals than you will find anywhere else. Certainly a unique book that is no longer available.