M&M (or MM) = the McKee-&-Mason bullet book, "Civil War Projetiles II: Small Arms & Field Artillery"
T&T (or TT) = Jim Thomas and Dean Thomas' book, "A Handbook of Civil War Bullets & Cartridges"
RBTR = Dean Thomas' books, "Round Ball To Rimfire" Volumes 1, 2, 3, and 4. Sometimes abbrviated to "Roundball2" or "RB4", etc.
SCWB = Tom Stelma's "book" (only available on CD, never in print), "Some Civil War Bullets"
Regards,
Pete