OK, I've come to the conclusion that this map is indeed, made of individual pieces and then taped (or glued) together. I'm leaning toward tape. I've circled several places where the drawing lines do not line up with each other, which they would if it were one big piece, folded.
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If it is taped, it is very thin tape... 1/8 or maybe 3/16 inch.
yeah, the offset you see between the pieces proves they are cut up and separated out by the spacing you see between them, if it was tape covering the map, those lines would all line up pefectly, or you could at least follow each line to the next.