ebook,Department of Defense and www.survivalebooks.com,US Army, Technical Manual, TM 55-4920-437-13&P, PROPELLER/ROT SHOP, PART NO. SC-4920-99-CL-A67, (NSN 4920-01-139-4546),,Department of Defense and www.survivalebooks.com,HISTORY / Military / Aviation,TRANSPORTATION / Aviation / Repair & Maintenance,TRANSPORTATION / Aviation / Piloting & Flight Instruction,TRANSPORTATION / Aviation / History,TRANSPORTATION / Aviation / General" />