Here's a b/w scan of the tripoint. I have highlighted thre actual boundary.
Scale 1:200,000, c.mid-1980s. Polish map.
Each square is 4km x 4km. Tripoint is about 2km away fomr roads in Poland.
Polish boundary is Bug river. UkBe boundary follows watercourses mainly, and 
west of Koszary, follows a small stream highlighted in blue into the Bug. 
Interesting Be salient north of the tripoint.
Hope this gets to you in time!
BW
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