VLF, LF and MF useful data

Wolf DL4YHF found this data that may be of interest to some blog readers

Snapped up from the VLF 'natural radio' group:
Interesting reading for long winter evenings ... about VLF, LF, and MF, a complete scanned book from 1972, descibing equipment, propagation, antenna theory, transmitter sites, etc.
The entire NAVELEX  handbook can be downloaded (chapter wise) from
 http://www.navy-radio.com/manuals/shore-vlf.htm
73,
Wolf  DL4YHF