"History of Cumberland County, Pennsylvania",
   by P. A. Durand and J. Fraise Richard, 1886:

Page vi - Cumberland County map.
Page 11 - Earliest List of Taxables - East Pennsborough Township, 1750
   - William Crawford and James Crawford
Page 26 - Carlisle, 1762 - John Crawford paid taxes.  
   Could this be the brother of our ancester, James Crawford? [No]
Page 27 - Allen Township, 1762 - James Crawford - presumably our ancester.
   Note absence of other "Crawford" names in 1750 and 1762 tax lists.
Page 30 - List of early settlers in Cumberland County names William Crawford.
Page 31 - List of property owners along Yellow Breeches Creek, including 
   J. Crawford (lived west of Charles Pippins, "Pippins Tract").
Page 88 - George Robinson was representative to July 4, 1776 military
   convention that chose Brigadeer General leaders of PA forces.
Page 88-89 - "One of the volunteer companies under Col. Watts, after the 
   latter had been set at liberty and been put again at the head of a regiment,
   was commanded by Capt. Jonathan Robinson, of Sherman's Valley, the son of 
   George Robinson, who suffered so much in the Indian war, and who now, though
   above fifty years of age, had entered the patriot army.  This company was in
   the battle of Princeton, and was for some time stationed at that town to
   guard against the British and to act as scouts to intercept their foraging
   parties."  [see also other references on page 89 to Capt. Jonathan Robinson]
Page 89 - Capt James Crawford commanded a company in the Second PA Battalion.  
   Is this the cousin of our ancester, John Crawford; being the son of 
   John Crawford, the brother of James?
Page 298-301 - No Crawfords mentioned as living in Lower Allen Township.
Page 315 - Same list as found on page 31 of property owners along Yellow
   Breeches Creek, including J. Crawford.  Seems to imply that Crawford
   property in present day Monroe Township.  There is a short section of
   the township along Yellow Breeches Creek touching York County to the South.
Page 356 - List of early settlers in Upper Allen Township does not include
   any "Crawfords."
Page 357 - a Crawford was a slaveholder in either Cumberland County or Upper
   Allen Township (ambiguous from the text) possibly as late as 1780.
Page 467 - Samuel C. Crawford - son of William Crawford and grandson of
   Thomas Crawford who was born in Cork, Ireland.  Cork is in the southern
   tip of Ireland, and not near Ulster, so I doubt if he is our relative.