The source of Peter bing the s/o Jacob Dittoe/Ditto is the Biography of Wilfred Philip Dittoe in a typescript copied from a" History of Cleveland Ohio, Biographical-Illustrated", Vol. 11, The S.J. Clark Publishing Co. 1910. no page number given.
Below is some information you may find interesting in putting together a picture of the Ditto family in when they were in what is now Adams Co. Pa.andnearby areas
From " Index to Adams Co. Pa. Septennial Census 1779-1821." Joan R. Hankey, published the Adams Co. Historical Society:
The following are found in the Septennial Census or tax rolls of what is now Adams Co. Pa.
Anthony Ditto: Germany Twp. 1800 Conewago Twp. 1807
Joseph Ditto: Berwick Twp. 1793-1800-1807
John Ditto: Berwick Twp.1782-1783-1786
From "The Particular assesment List for the Baltimore and Carroll Counties 1798" George Horvath Jr, Family line Publications, 1986, pg. 87
Pipe Creek Hundred: Jacob Ditto pt. Iron Intebtion; hewd log dwlg hse, sstry, 24x18 stone add. istry 14x14; stone mill house, 1stry, 24x20; saw mill 40x13; log barn 40x20. ------ Baptisms from the Conewago Chapel Records Published by the John Timmon Reilly Historical Society, McSherystown, Pa.:
Jacob and Catherine Ditto: Henry b, 10-15-1795 bap. 10-18-1795 Sally b. 7-28-1803 bap. 8-7-1803
Joseph and Helena Grimm Ditto Michael (surname transcribed Dilo) 3-29-1795 bap. 4-19-1795. Joseph b. 1-15-1797 bap. 5-14-1797 Jacob b 4-1-1801 bap. 5-14-1801
You might also want to take a look at the BULLETIN, Catholic Record Society of the Diocese of Columbus (Ohio) Vol. 2, No. 3. (no other date) an article entiteled The Pennsylvania Homes of the Fink and Dittoe Families by Donald M. Schlegel.