if you're interested, you can download (or look) from this address: http://pzk.katowice.pl/index.php?p=1_20_Literatura-radiowa above 60 valuable radio amateur publications by Krzysztof Dabrowski OE1KDA in the Polish language.
Here you can find e.g. publications on KV antennas, VKV, UKV, MW, wave propagation, tinkering, digi módoch, amateur TV, measurements, amateur telemetry and astronomy, amateur devices (RX, TX TCVR, SDR, DMP), but also about Raspberry and much more.
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.
YOU 73 by Laco, om5ld