What has the author Andreas Ruffing written?

Paul Miller Ruff has written:

'Old Harrold Cemetery, Lutheran and Reformed, Westmoreland County, Hempfield Township, 1772-1889' -- subject(s): Genealogy, Inscriptions, Lutherans, Old Harrold Cemetery, Lutheran and Reformed (Hempfield, Westmoreland County, Pa.), Registers, Registers of births

'St. Matthew's Lutheran Church, Wall Rose, Beaver County' -- subject(s): Church records and registers, Genealogy, German Americans, Lutherans, Registers, Registers of births, St. Matthew's Lutheran Church (Wall Rose, Pa.)

'Christ Evangelical Lutheran Church, Beaver Falls, Beaver County, Pennsylvania' -- subject(s): Christ Evangelical Lutheran Church (Beaver Falls, Pa.), Church records and registers, Genealogy, Lutherans, Registers, Registers of births

'Zion Lutheran Church' -- subject(s): Church records and registers, Genealogy, German Americans, Lutherans, Registers of births, Venango Region (Pa.), Zion Lutheran Church (Venango, Pa.)

'Hebron Lutheran Church' -- subject(s): Church records and registers, Genealogy, German Americans, Hebron Evangelical Lutheran Church (Blairsville, Pa.), Lutherans, Registers of births

'Immanuel Lutheran Church, Irwin, Westmoreland County, parish records' -- subject(s): Church records and registers, Genealogy, Immanuel Lutheran Church (Irwin, Pa.), Lutherans, Registers, Registers of births, Swedish Americans

'St. John's Lutheran Church' -- subject(s): Church records and registers, Genealogy, Lutherans, Registers of births, St. John's Evangelical Lutheran Church (New Castle, Pa.)

'Good Hope Church' -- subject(s): Church records and registers, Genealogy, German Americans, Good Hope Church (West Salem, Pa.), Lutherans, Registers of births

'Zion English Lutheran Church' -- subject(s): Church records and registers, Genealogy, Lutherans, Registers of births, Zion's English Evangelical Lutheran Church (Middle Lancaster, Pa.)

'Brush Valley Lutheran Church' -- subject(s): Brush Valley Lutheran Church (Brush Valley, Pa.), Church records and registers, Genealogy, German Americans, Lutherans, Registers of births

'Records and history of Mt. Zion Lutheran Church, a.k.a. Stecher's Church' -- subject(s): Church records and registers, Genealogy, German Americans, Lutherans, Mt. Zion Lutheran Church (Ginger Hill, Pa.), Registers, Registers of births