Good discography site featuring (among many others) the output of the Goldwax (James Carr), Mala (Box Tops, Bobby Wood), and Bell (James & Bobby Purify and Oscar Toney, Jr) labels. These were some of American's earliest recordings from 1966-1968 (all the above appear under the Bell Label heading):
Then go here for listings on the Scepter label featuring BJ Thomas and Dionne Warwick's American recordings:
Or go here for the Minit Label (Bobby Womack's American Recordings):
Lots more here -- worth the effort!