Zenith Trans-Oceanic R-520/URR (TM 11-877) manual, reprint.

These is a digitally copied and enhanced manual for the Zenith Trans-Oceanic R-520/URR, the military version of the H500It is clear, clean, and easy to read.  It is printed on premium 24# paper with heavy covers and bound with a plastic comb.

The manual has been reprinted at 8 1/2 X 11 with about 190 pages and two large one piece 11" X 17" fold out schematics

It is dated 26 January 1953 and includes: addenda to the instruction book dated February 3, 1953, introduction, operating instructions, organizational maintenance instructions, theory, field maintenance instructions, shipment and demolition, index, appendix I - references, appendix II - identification table of parts, and schematic. 

It also includes TM-877 changes No.1 dated 18 November 1955 with schematic.