This is the first edition limited to 747 handnumbered copies.
The second edition came with a different artwork and isn't limited.

VLF magnetosphere recordings (PL1, PL2): courtesy by Stephen McGreevy
Vostok, Salyut, Soyuz original recordings (PL3): courtesy by Sven Grahn
Holter Test recordings (PL4): unknown source
Pulsar recordings (PL9): NRAO 93m
SW scanning and reception (PL5, PL6)
Neon Tubes radio signal recording (PL6)
High Voltage Transformer recordings (PL7)
Analog and Digital electronics (PL1..PL9),
Project: Massimo Magrini
Digital audio programming: Computer Music Lab of CNUCE, National Research Council of Italy (C.N.R.)
Remastering: Dr, Sound, Pisa.
Cover and booklet photos courtesy by MIT Museum of Science, Boston and Nikola Tesla Museum, Belgrade.