The National Trust assigns a unique two-letter abbreviation for each National Trust Historic Sites for the internal management of records, including collection records, photographs, and impact reports, as follows:
AS Abiel Smith School
AC Acoma Sky City
AB African Meeting House, Boston
AN African Meeting House, Nantucket
BG Belle Grove
BR Brucemore
CH Chesterwood
CL Cliveden
CM Cooper-Molera Adobe
DC Decatur House
DH Drayton Hall
FH Farnsworth House
FI Filoli
FW Frank Lloyd Wright Home and Studio
GA Gaylord Building
GH Philip Johnson Glass House
HP Hotel de Paris Museum
HQ Headquarters (aka 1785 or Mellon Building)
KY Kykuit
TM Lower East Side Tenement Museum
LY Lyndhurst
MT James Madison’s Montpelier
OT Oatlands
PL Pope-Leighey House
LC President Lincoln’s Cottage
RO Robie House
SH Shadows-on-the-Teche
TS Touro Synagogue
VF Villa Finale
WD Woodlawn
WW Woodrow Wilson House