I have the following original (not photo copy) manual for sale:

TM-11-4001 War Department Technical Manual
Repair Instructions for BC-312 (various models) and BC-342 (various models)
War Department, February 1945

The manual includes a description of operation, repair and alignment
procedures, troubleshooting procedures, schematic diagrams, assembly
pictorials, and material list.

There are some light pencil marking on a few of the pages but otherwise the
manual is in very good condition. The price for the manual is $30.00, I will
pay shipping to US or Canada.

I also have a complete tube set for the BC-342 (removed from a working
unit), the main tuning capacitor assembly (consists of a four section
variable capacitor, each 13-226pF), and various other variable capacitors
with values of 3-25, 4-50, 4-75, and 6-100pF. One additional item is the
front dial plates consisting of two circular plates marked with frequencies
and bands, from the BC-342. If you are interested in any of these hardware
items please let me know and I will give a better description or I can send
you some pictures.

Al KA5JGV
San Antonio, TX