Here is a list of great sites for researching BSP's, Histories, Trivia, How-to and more.

Telephone Collectors Library

Bell System Practices Org.

Old Telephones (Paul-F)

Telephone Tribute

We Do Phones

Navy Salvage

Greg Ercolano's 1A2 Key Phone System Page

Phil McCarter's Telephone Switch Restorations Great site for images! (No documents)

PM me know if you have any you would like to add to the list.