I like Crossman and Whelen because they were instrumental in the early design of the bolt action custom rifles.
Townsend Whelen's grandson is collecting all the writings of TW which is a monumental job. Whelen easily wrote more than Keith and O'Connor combined.
Speaking of Crossman I have just scanned “The Metamorphosis of the New Springfield” which is fifteen pages long and if any would like a copy email me.
Kelver published a book of Pope letters titled 'Respectfully Yours, H.M. Pope".
I'm very luck because I have all the American Rifleman with the early writings of Crossman, Whelen, Keith and others. Many of "Arms and the Man" as well as a lot of "Outer's Book".
No pictures of my mess ;-), looks like what happens when you mix high explosives and books. This is the only halfway organized case.