The Fox Hole Radio (Foxhole Homestead Book 14)
Radios That Work For Free
Radios That Work For Free II
Beer Can Crystal Radio: How to make your own crystal radio using a beer can
The New DXer's Handbook - Second Edition
Boy's Crystal Set, Your First Self Powered Radio
QRP: The Zen of Amateur Radio
Record Keeping for the Radio Experimenter
Having Fun With Ham Radio: Letting my inner geek out
Minimum QRP: Doing more with under five watt amateur radio