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These materials are owned by the American Catholic Historical Society and maintained at the Philadelphia Archdiocesan Historical Research Center, 100 E. Wynnewood Rd. Wynnewood, PA 19096.  For more information please see:

Printed letterhead: 736 Pine Street.

Enclosure may be manuscript: Flick, Lawrence F.  "Mathias James O'Conway, Philologist, Lexicographer and Interpreter of Languages, 1866-1842." Records of the American Catholic Historical Society of Philadelphia. v. 10.  Philadelphia: American Catholic Historical Society, 1899: 257-299.