1970s Polish Posters from the Montague Family Collection

Just a few days ago I recovered four of the following five posters from my parent's basement. There is far more to this graphic design haul, but I'll start with the Polish posters. My father taught art history and design history, for decades starting in the mid 60s. He has quite a lot of interesting ephemera stored in decidedly non-archival conditions. The Polish posters were sent to my father from my uncle, Stephen Montague who from 1972 to 1974, was on a Fulbright studying composition at the Frédéric Chopin Academy of Music in Warsaw and the Experimental Music Studio of Polish Radio. Four of the posters are for the Warsaw Autumn music festival, which is a festival of contemporary music (now in its 53rd year). I've been trying to find images online of the other Warsaw Autumn posters, but I've only found 1970, I would like to see them all together.

Warsaw Autumn 1971, Hubert Hilscher, 26"x38"

This one I have actually had for two years, I found it in my Grandparents garage in Florida. Unfortunately the lower right hand corner it torn off and the area around it is crumpled. Oddly, I like the two Hilscher posters I have, far more than anything else I have found by him online.

Warsaw Autumn 1973, Hubert Hilscher, 26"x38"

Warsaw Autumn 1974, Waldemar Swierzy, 26"x38"

Warsaw Autumn 1974, Jan Mlodozeniec, 26"x38"
I seem to remember this poster hanging in our house when I was a kid.

American Western Painting Exhibit (Amerykanski Zachod)
1974, Jan Mlodozeniec, 26"x38"