Fundamentals of Kayak Navigation (by David Burch, 3rd edition)
in-depth treatise on navigation by kayak, including charts, compass use, tides and currents, wind and waves, etc.

Kayaking the Maine Coast (by Dorcas Miller, 1st edition)
this comprehensive guidebook covers the Maine coast almost inch-by-inch, providing detailed information on launch sites, public lands and islands, dangerous areas, local and natural history, and the prettiest coastal areas.

Field Guide to Birds of North America (by National Geographic, 4th edition)
field guide including excellent color illustrations and text descriptions allowing conclusive species identification.