Southern sector Danang TAOR for 27th Marines was found in several map sheets, the predominant one being Sheet 6640-IV.
The map as a whole can be found at :
http://www.virtual.vietnam.ttu.edu/cgi-bin/starfetch.exe?D1p8WCXnruJhXYoNprZZi4QuIZZc7w.QKtgYVk.UJPl@i2WUuTMO9MpZl.esdfAHXNhv5LhFdd9cghpxE.FL@u3oImM1ymzk/6640-4.jpg"
A B/W version of the map:
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