TM 11-5820-358-10.pdf  Operator's Manual, Radio Receiver R-390A/URR.  16 January 1961.
TM 11-5820-358-35.pdf  Field and Depot Mainenance Manual, Radio Receiver R-390A/URR.  8 December 1961.

These files are made available with the compliments of August Johnson, KG7BZ.