I purchased a large lot of bit keys, railroad and other drill and flat keys from a defunct Boston Lockshop. Among the keys that I have still not sorted, are catalogs of the Graham Mfg Company of Derby Ct., from moments before WWII restrictions on metal and letters to dealers regarding allotments, as well as the end of WWII Announcements of the first group of commercial keys to be reintroduced for shipment, and the phase in of entire line. I do not know if these documents are all over the place, or very rare. To preserve these items, I have elected NOT to remove from binding for scanning and OCR / Cross referencing etc. until I know they are not needed in a museum.