History of that part of the Susquehanna and Juniata valleys, embraced in the counties of Mifflin, Juniata, Perry, Union and Snyder, in the Commonwealth of Pennsylvania...
Edited by F. Ellis and A. N. Hungerford. Published in Philadelphia by Everts, Peck & Richards, 1886, Pages 741-749
Samuel, William, James, John and probably Joseph McCulloch were brothers who came to America from Scotland. William was a soldier five years prior to June 29, 1813, when he re-enlisted in Captain Walsh's First Regiment Artillerists; wounded in battle at New Orleans; discharged in 1815. Samuel's sons were John, James, Thomas, George, Samuel and Stewart. Joseph was the father of General George and Samuel, the latter being the father of Dr. John McCulloch, of Huntingdon, once a member of Congress.
BIOGRAPHY: William Turbett McCULLOCH, Juniata Co., PA
The Commemorative Biographical Encyclopedia of the Juniata Valley,Comprising the Counties of Huntingdon, Mifflin, Juniata, and Perry,Pennsylvania.Chambersburg, Pa.: J. M. Runk & Co., 1897, Volume II,Page 947.
"WILLIAM TURBETT McCULLOCH, deceased, a prominent citizen of Port Royal, was born June 24, 1853, on a farm in Centre township, Perry county. He was a son of Samuel and Edith Beale McCulloch. His grandfather, Samuel McCulloch, was a native of Scotland, of Scotch-Irish extraction, and emigrated to American, settling in Juniata county, Pa., where he owned McCulloch Mills."
You may check out the following helpful resources:
MIDDLE TUSCARORA PRESBYTERIAN CHURCHYARD
MCCULLOCH MILLS, TUSCARORA TOWNSHIP
JUNIATA COUNTY, PENNSYLVANIA
LAST WILL AND TESTAMENT OF JANE McCULLOCH (daughter of Samuel McCulloch and Niece of James McCulloch)
VAN SWEARINGEN CHRONOLOGY
ELLIS & HUNGERFORD, BIOGRAPHICAL ENCYCLOPEDIA, 1886