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Catholic University of America—University Archives
Creighton University Archives
Dayton, University of—University Archives
Georgetown University Libraries Special Collections
Holy Cross College Archives
Loyola University-Chicago, University Archives
Loyola University-New Orleans—J. Edgar and Louis S. Monroe Library Special Collections
Marquette University Archives
Notre Dame, Archives of the University of
Santa Clara University Archives
St. Louis Room, St. Louis University
Villanova University Archives
Archdiocese of Cincinnati
Archdiocese of Detroit
Archdiocese of Los Angeles
Archdiocese of New Orleans
Archdiocese of Philadelphia
Diocese of Pittsburgh
Archdiocese of St. Louis
Claretian Archives
Maryknoll Archives
Midwest Jesuit Archives-St. Louis
National Archives, Society of the Sacred Heart
New England Province, Society of Jesus Archives
Passionist Historical Archives
Sisters of St. Joseph of Carondelet-St. Louis Province Archives
Review for Religious, digital archives
Thomas Merton Center, Bellarmine University
Vatican Film Library, St. Louis University
Cushwa Center for the Study of American Catholicism
Academy of American Franciscan History
American Catholic Historical Association
American Catholic Historical Society (American Catholic Studies)
American Catholic History Classroom
Catholic Educator's Resource Center
Catholic Encyclopedia
Catholic Research Resources Alliance
Local Catholic History-Indiana
Making of America
My Parish