Hi,
if you are interested, you can download (or view) from this address: http://pzk.katowice.pl/index.php?p=1_20_Literatura-radiowa over 60 valuable radio amateur publications by Krzysztof Dabrowski OE1KDA in Polish.
Here you can find e.g. publications on HF antennas, VHF, VHF, MW, wave propagation, tinkering, digi modes, amateur TV, measurements, amateur telemetry and astronomy, amateur devices (RX, TX TCVR, SDR, DMP), but also about Raspberry and many others.
Everything is in pdf format in Polish with diagrams and pictures mostly in color. I think that everyone will find something of interest here. I wish you a beautiful evening study at the PC for a few nights.
VY 73 de Laco, om5ld