Mat Resist was kind enough to scan and forward these manuals. They’re in .pdf format. Enjoy.
Blickensderfer No. 5 (1896)
Remington Rand Touch Typing Method featuring an early 50s Quietriter
Smith Corona Super-Silent, Silent and Sterling (late 40s- early 50s)
Textbook on Typewriter Repair, featuring Underwood, Royal, Smith Premier #2, Smith Premier Visible #10-11, Royal, Remington #7, Remington Blind, Remington Visible #10-11, Oliver #3 and #5, L.C. Smith, Monarch Visible, Fox Blind, Fox Visible, and various type samples
Underwood Golden Touch Manual, featuring both desk and portable models (late 50s-early 60s)
Underwood Repair Manual (1920)
Underwood Standard (1930 – #3, 4 and 5)
These are the only manuals I have.
Jay Respler of Advanced Business Machines has manuals, ribbons and things for sale.
Ernie at Office Machines Americana also has manuals, ribbons, etc. for sale.