https://www.naswa.net/images/Radio_Monitoring_A_How_To_Guide.pdf
https://www.naswa.net/journal/areybook
FREE in PDF The Ham Radio Handbook by W6PNF and many other books and magazines
SHORTWAVE LISTENING GUIDEBOOK
FREE in PDF
https://www.naswa.net/images/Radio_Monitoring_A_How_To_Guide.pdf
https://www.naswa.net/journal/areybook