Hi Mike,
I have "The Bongo Book" and I think it's a great book for beginner to intermediate (I'm sure that even professional bongoceros can find it interesting!).
64 pages containing: martillio+70 variations, 70 one/two bars fills, bolero - jazz - rock - brazilian - afro, danzòn - mozambique - songo - bomba - plena -merengue - cumbia - beguine rhythms, a bongo solo and few pages of exercises: ALL WITH AUDIO! (CD-rom).
Then you can also find: history, pictures of technique, maintenance, glossary, bibliography and 4 interviews: Jack Costanzo, Armando Peraza, José Mangual and Candido Camero.
If you want to buy it on-line use this link:
Click Here!
If you need further info let me know :)
Bye.