I see you have the "History of Money"....great book. You're only the 5th person who has ever had (or heard of) that book that I've known of.
I will recommend two reference books.
can get this for under 5 bucks now......great way to understand what you are eating.
Henry Louis Gates IS a clown of the highest order, but I don't think there is (in book form) a better clearinghouse or source of general information about African people anywhere else.
There are 3 versions of the encyclopedia.....
. a 5 volume hardcover set that's wild expensive still,
the regular version (about 2100 pages and 10 lbs),
and the small edition..paperback about 1200 pages
get the regular version and make sure its THAT one. I've paid as little as $ 7 and as much as $20 for it
*Note it's a print encyclopedia from over 10 years and it''s not updated each year...so it's dated in that sense, but it's a GREAT reference book.