TWTM - The Well-Trained Mind: A Guide to Classical Education at Home
WTMP - Well-Trained Mind Press
WTMA - Well-Trained Mind Academy
SWB - Susan Wise Bauer
SOTW - The Story of the World
From The Story of the World Activity Books:
RA is read aloud.
IR is independent reading (so is the typo "RI")
OOP is out of print
LFA is Limited Format Availability
E-Only is electronic-only (like Kindle or eBook, but not in paper-print)
HOTW - The History of the _____ World - the series
HAW - The History of the Ancient World
HMW - The History of the Medieval World
HRW - The History of the Renaissance World
OPG - The Ordinary Parent's Guide to Teaching Reading
WWE - Writing With Ease
WWS - Writing With Skill
TCW - The Creative Writer
FLL - First Language Lessons
GFTWTM or GftWTM - Grammar for the Well-Trained Mind
TGG - The Grammar Guidebook
TDD - The Diagramming Dictionary
WSW? - Who Said What?
TGS - Telling God's Story
MFTS - Math Facts that Stick
MWC - Math with Confidence series
KMWC - Kindergarten Math With Confidence
FGMWC or 1GMWC or FMWC - First Grade Math with Confidence
SGMWC or 2GMWC or SMWC - Second Grade Math with Confidence
TGMWC or 3GMWC or TMWC - Third Grade Math with Confidence
FGMWC or 4GMWC or FMWC - Fourth Grade Math with Confidence
AB - Activity book (or, in context, sometimes Audiobook)
SP - Student pages
WB - Workbook
IG, IT - Instructor Guide, Instructor Text
HC - Help Center, with FAQs
USPS - United States Postal Service
UPS - United Parcel Service