http://www.rpg.net/reviews/archive/11/11562.phtml
Jannica Thales's Summary:
The Monster Manual 3 (MM3) is a d20/D&D monster supplement for a fantasy campaign. The back of the book suggests that a DM needs the DMG as well as the PH to use the MM3. But while the MM3 could technically stand by itself, I wouldn’t use it without the 3.5 Monster Manual. The Monster Manual is centered around story needs for fantasy gaming, while the MM3 is more of a meta-gaming book.
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