Oshkosh:
On-going to find some brochures and/or leaflets on Oshkosh but perhaps more people are interested
in the history and magnificient product of Oshkosh. There is a book by MotorBooks: 75 Years Oshkosh.
Not expensive and in 128 pages with numerous nice pictures you are informed about this company.
Attached a picture of the cover, I can recommend the book!