Depends on what you mean by "surrounds" and what your purpose is e.g. navigating the logging roads, camping, hiking, paddling etc. Here are some additional resources:
The Appalachian Trail maps obviously show the AT and are good for other trails that link with the AT.
The AMC has maps related to its facilities (Little Lyford Pond, Long Pond, Medawisla) and nearby trails, some of which are part of a new network of linking trails.
The Moosehead Lake Chamber of Commerce is a good source for many hikes in that area and has narrative descriptions, and maybe maps, on its website. There is a new trail under development that connects the many existing trails into a possible loop around Moosehead Lake incorporating many of the nearby peaks.
"Southern Piscataquis Regional Recreation Map and Guide", a nicely detailed map of the area between Baxter Peak, the northern reaches of Moosehead Lake and Dexter to the south is available from the Piscataquis Economic Development Council with cartography and design by Larry Garland, who does the AMC maps. It shows roads, campsites, trails ... they're listed at $4.50 but free when passing through the North Maine Woods gates.
Check with North Maine Woods, an association of landowners which operates many of the gates, for its annual guide which includes a detailed map of the area north of Baxter Park and Moodehead Lake to the Canadian border. It lists as $3.00 but is also free upon passing through the gate.
... of course, passing through the gate is not free by any means (2009 $10 per person per night, $4 for seniors) but if you are planning to spend some time in those areas, it is well worth the charge in my experience ...