FS - Copy of a Collins R-392/URR manual. Technical manual no. 11-5820-334-34, Technical Order No. 31R1-2URR-422. 168 pages. Comb bound. Contains Theory, Troubleshooting, Repairs and Alignment, testing procedures, references, schematics, charts, pictures etc. $25.00 plus $3.85 Priority shipping. J W7KSG