div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Karas a · 2021 2 3 · In the spr ing of 1939 12 Croups Of the Polish Air force were operational After the Soviet Union attack on Poland on September 17 1939 the sur— viving src=https:reader035vdocumentsnetreader035viewer20220716076145016734130627ed50b5dbhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: Karas a · 2021 2 3 · In the spr ing of 1939 12 Croups Of the Polish Air force were operational After the Soviet Union attack on Poland on September 17 1939 the sur— viving src=https:reader035vdocumentsnetreader035viewer20220716076145016734130627ed50b5dbhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdiv