Dr Maloney, an anthropologist, has written the best general reference on the history of the country, but it is not readily available, even in the Maldives.
One for history buffs, with Bell attempting to explain the tangible, although insubstantial, remains of early civilisations.
One of several pictorials by marine biologist Anderson, guaranteed to whet your appetite before heading for the depths.
Describes all of the established dive sites in detail; it's a good investment and souvenir.