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Radio
Radio Pioneers
Impoverished Radio Experimenter 1
Impoverished Radio Experimenter 2
Impoverished Radio Experimenter 3
Impoverished Radio Experimenter 4
Impoverished Radio Experimenter 5
Impoverished Radio Experimenter 6
Voice of the Crystal!
Instruments of Amplification
Thordarson Transformer Manuals
Amateur Radio Beginner's Guide
Crystal Receiving Set
Official 1934 Shortwave Manual
Official 1935 Shortwave Manual
Manufacture of Wireless Gear
Vacuum Tube Regenerative Rcvr
Build the Twinplex

Electrical
Microphones & Telephones
Electrical Things Boys Like to Make
Dynamos & Electric Motors
Maver: American Telegraphy
Armature Winding & Motor Repair
LeJay Manual (50 different projects)
Dangerous Electricity
Build a Universal Coil Winder
The Boy Electrician Build a Magneto Magnetizer
Non-ferrous Electromagnet
Solenoids & Electromagnets
Making Permanent Magnets