Courtesy of the Library of Congress: almost all sheets of a 1:50,000 AMS map of Poland, dated 1954-1968 (series M751) produced and published (mainly) by US Army Map Service (index sheet). There are approx. 620 new sheets, including a small number of ‘doubles’, i.e. different print runs, although they're most likely identical, despite various print dates - updates from 'Corona' spy satellite programmes only appear on maps published in late 1970s onward. What's missing? - a few sheets from 'Kresy' (Borderlands), a few more from the PL-CS border. A few dozen sheets from Western Poland was held under a different AMS series (M746, „Germany (Polish Administration), at least in edition 1. We will scan them too, though we don't yet know when. Other 1:50,000 series from Eastern Europe, such as those related to the Baltic Countries (series: N751, N752, N753), and series N701 ‘Western USSR’ are also due to be scanned but not a priority, given the 'fan-like' expansion of European land mass looking eastward, these sets will easily include a few thousands sheet - not a quick job.

Important: do NOT rely on publication dates (1954 - 1968); the sheets are purely a compilation from maps captured by Germany during WW2 and, post-1945, fell into the hands of the US Army in their occupied zone of Germany. Original materials are Polish, German and Soviet maps dated 1928 - 1944, scale 1:25,000 - 1:100,000. To identify the current location, current (Polish, Belarussian, Ukrainian and Lithuanian) place-names have been provided for each sheet, alongside historical place-names (click on the blue arrow next to each sheet). Note that some settlements have disappeared after WW2, others changed their name. Be weary of 'generic' names while searching on current maps (google maps, openstreet maps), there are dozens of identical or near-identical place-names in Eastern Europe for 'Upper Birch', 'Old Village',  'Bridgend', 'Hinderford', etc. To make sure you found the correct place, always try to match the location in tandem with larger, more uniquely named towns nearby. For the area of Belarus and Ukraine, Openstreet maps appear to show more terrain details and smaller place-names than Google maps, but are less user-friendly for searching.

Also from the Library of Congress collection, two Romanian sheets of Odesa and vicinity, 1:20,000 (North and South Sheet) incuding field fortifications. Maps are dated 1941, when the Romanian army, alongside German units, attacked the Soviet Union along the southern front.