Here are some remaining unknown tracks I'm in the dark about.
All in the range of 1979~1981.

http://home.telfort.nl/vortex/x/104.mp3
http://home.telfort.nl/vortex/x/146.mp3
http://home.telfort.nl/vortex/x/028.mp3
http://home.telfort.nl/vortex/x/044.mp3