A partial listing of resources in my library used to grow my family tree:

(PA) York County Church Records of the 18th Century: Volumes I, II, III

(PA) Adams County Church Records of the 18th Century

(PA) Conewago Chapel Records

(MD) Marriages Licenses of Frederick County 1778-1865

(MD) Moravian Family of Graceham MD  1759-1871

(MD) Washington County Marriages INDEX  1799-1860

(MD) Names In Stone - Frederick Co. Tombstone Records

(MD) Bridge In Time - 1850 Census of Frederick County

Family Histories:
William Elder (Frederick Co. MD)
Arnold Livers  (Frederick Co. MD