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This envelope used to be a map
(feddit.org)
This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
I believe you are correct about it being a military map. The visible Polish(?) text is part of the map legend given in German and English.
Yup, Polish. But this is pretty much what generic maps look like in the Czech Republic so probably not a military map.
Edit: It was not hard to find the specific publication. See my other comment.