- CLEN : Mathias C. Lenihan: Manuscripts
- PLEN : Mathias C. Lenihan: Printed Material
- PLEN 1/01 Document : Memorial card for Patrick Joseph Cardinal Hayes 1938/0904
- PLEN 1/02 Document : Clipping re Edmund Burke from N.W. Catholic 1901/01
- PLEN 1/03 Document : Prayer Leaflet and Relic: Blessed Mardin de Porres, O.P.
- PLEN 1/04 Document : Instructions to Pastors of the Holy Name Society / by Rev. Charles H. McKenna, O.P.
- PLEN 1/05 Document : Proceedings of the First Biennial and Seventeenth State Convention of the Roman Catholic Mutual Protective Society of Iowa 1896/06
- PLEN 1/06 Document : Dubuque Archdiocesan Total Abstinence Union - Constitution and By-Laws 1902
- PLEN 1/07 Document : St. Joseph's Roman Catholic Student Fund Society - Articles of Incorporation and By-Laws - La Crosse, WI 1906
- PLEN 1/08 Title : Talking Points about Tuberculosis: Notes for a Series of Twelve Lectures / National Tuberculosis Association, NY 1920/07
- PLEN 1/09 Title : Some of the Causes of Modern Religious Skepticism: a Lecture Delivered in St. John's Church, St. Louis, on Sunday evening, Dec. 17th, 1882, by Right Rev. P.J. Ryan 1883
- PLEN 1/10 Title : Summer Tours to Europe in connection with the Sixth Annual American National Pilgrimage to Rome and Lourdes under the management and direction of Mr. and Mrs. Francis H. Throop 1899
- PLEN 1/11 Document : Pastoral Letter of the Archbishops and Bishops of the United States Assembled in Conference at the Catholic University of America 1919/09
- PLEN 1/12 Title : Emmanuel: Official Monthly of the Priests' Eucharistic League and the Apostolic Union 1899/01,03
- PLEN 1/13 Title : The Overland Route, Egypt, and the Wonders of the Nile: Descriptive Lecture of a Voyage from Southampton to Alexandria, Up the Nile, and Through the Suez Canal, prepared to accompany the series of dissolving views painted by Newton & Co., Opticians and Scientific Instrument Makers, by special appointment to Her Majesty the Queen . . . c1880
- PLEN 1/14 Title : A Morning at the National Gallery, London: Grand Art Exhibition and Entertainment given with success at Lyceum Theatre, New York, by Mr. H. Halsey-Stirling of London - Trinopticon Magic Lantern Show 1900
- PLEN 1/15 Title : Bolling Arthur Johnson's Illustrated Entertainments: Stories of the Old South and the New; The Passion Play of 1900; The Paris Fair of 1900 - Magic Lantern Shows. 1900
- PLEN 1/16 Document : Map of Great Falls, Montana