I posted these on social media earlier and it occurred to me it'd be worth a post here: The similar maps of DA1 (Adventures in Blackmoor) and DA4 (Duchy of Ten). Maybe not new to y'all, but perhaps it is.
Not quite identical. I noticed in the southwest quadrant, DA4's map has additional settlements (Fort Pelwar, Tor Kurram, Fort Wazir, Fort Janrud, Camp Mahoud, Camp Orakzal, and Fort Jank).
Most of the rest of the map seems identical to me, except DA1's map is (oddly enough) called "Map 5: The Northlands" and DA4 is "Map 1: The Northlands".
TSR did code them correctly in the margins.
DA1 = 9172XXX0701 DA4 = 9205XXX0701
Any additional insight, please post it.
-Wayne
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