MLB - moderate to light label bubbling
MHB - moderate to heavy label bubbling
DL - dirty label or dirty cart (stains, etc.)
SS - still sealed - These may not always be the original factory sealed cellophane
TS - torn shrink-wrap or torn cellophane
CO - cut-out (a cut-out is a tape that was marked for discount. They have a cut, burn, or drill-hole on the end of the cart to indicate this.)
WL - writing on label
CRC - record club
CR - canadian release
PS - picture sleeve cover
WL - writing on label
BT or Boot - bootleg
FRNTLT - front label torn
BTMLT - bottom label torn

Thanks!!

HM - Home Made
BCKLT - back label torn
LM - babel missing
WC - white Cart
SL - sticker on label
ER - english release

These are some of the old codes that still may be on the list:

LBL - label
LBLS LTL Worn - labels little worn
BTM - bottom
FRT - front
BL - bad label (usually dirty, really bad bubbling; well loved & worn!
HB - heavy bubbling
LB - label bad