Does anyone know where I may be able to find an old map or history of the development of VA locations on-line so that I can figure out where Martinsburg, Virginia would have been in 1745. I've found a reference that states the Henry family relocated from Lancaster, PA to Martinsburg, VA in 1745. As early as 1752 I find them in the area of Shenandoah that later became Warren Co. but know of no Martinsburg there. Any ideas? Thanks.

Berkeley County, WV http://www.rootsweb.com/~wvberkel/