1787 Survey Map
About 1785 Stephen Van Rensselaer III hired William Cockburn to make a comprehensive survey of his Helderberg wilderness in preparation for leasing the vancant land in the hills surrounding the already settled valleys. The resulting 1787 survey map shows roads, churches, mills, and streams, gives the lot number and name of each leaseholder.
Beers 1866 map of Berne
Beers 1866 map of Berne from "New Topographical Atlas of the Counties of Albany and Schenectady, New York." Philadelphia: Stone & Stewart Pub., 1866 shows the family plots and family names as of 1866.
1900 Topographical Map
Here is a current map provided by MapQuest.