This index was compiled by two members of the Westmoreland County Tax Mapping Department. They used survey books, road books, deeds and maps to make it as accurate and complete as possible. Permission to reproduce this information in book form was granted to Patty so that the records might be more accessible to the public. Warrants in these records cover the mid-1700s to about 1800 period. Westmoreland County was formed from Bedford County in 1773. Bedford County was formed from Cumberland County in 1771. For this reason, patents listed in Book AA are possibly housed in either of these two counties. (The state land office was not opened until 1769.) Patents in these records cover the period 1773 to the early 1900s. Allegheny, Fayette, Greene, and Washington Counties were formed from Westmoreland County, thus, some of the records from Westmoreland County are now located in these counties. These early land warrants and patents are overlayed on modern maps so the exact location of the land can be determined. Maps can be purchased from the Westmoreland County Tax Mapping Dept. The maps show the location of the land, number of acres, and date of warrant or patent. A fold-out “Frontier Map” showing a grid work of the map numbers is included in the book.