I really love these reference books that are densely packed with small illustrations or photos on every page, cataloging animals, insects, etc.
Here are two prime examples:
http://www.amazon.com/Sibley-Guide-Birds-David-Allen/dp/0679451226

http://www.amazon.com/Sibley-Guide-Trees-David-Allen

Anyone have any others to recommend?
Here are two prime examples:
http://www.amazon.com/Sibley-Guide-Birds-David-Allen/dp/0679451226
http://www.amazon.com/Sibley-Guide-Trees-David-Allen
Anyone have any others to recommend?














