LexisNexis completed their efforts in late 2006 (covering 1789-1969). LexisNexis rescanned the maps in the set via a partnership with the University of Maryland, College Park.
LexisNexis finished their mapping project in late 2006, which covered the period from 1789 to 1969. They collaborated with the University of Maryland, College Park to re-scan the maps within this collection.