- UPEL 61/35 Letter : Samuel M. Ordetx to AM 1898/0621
- UPEL 61/35 Letter : Mrs. M. O'Connor to Rev. Father 1898/0622
- UPEL 61/35 Letter : Victor Osgood to AM 1898/0623
- UPEL 61/35 Letter : Frank A. O'Brien to AM 1898/0627
- UPEL 61/35 Letter : Jeremiah O'Connor to Dear Father 1898/0628
- UPEL 61/35 Letter : David J. O'Leary to Rev. Sir 1898/0707
- UPEL 61/35 Letter : J.J. O'Brien to Honorable Head of the Congregation Notre Dame 1898/0720
- UPEL 61/35 Letter : Mrs. M. O'Connor to AM 1898/0728
- UPEL 61/36 Letter : Charles Hinze to Brother Paul Hermit 1898/0802
- UPEL 61/36 Letter : M.J. O'Keeffe to Rev. Sir 1898/0802
- UPEL 61/36 Letter : Manuel R. Otero to AM 1898/0803
- UPEL 61/36 Letter : Frank A. O'Brien to J. French 1898/0809
- UPEL 61/36 Letter : Fred M. Odena to AM 1898/0809
- UPEL 61/36 Letter : Fred M. Odena to AM 1898/0812
- UPEL 61/36 Letter : Raymond G. O'Malley to AM 1898/0815
- UPEL 61/36 Letter : Edward E. O'Brien to AM 1898/0817
- UPEL 61/36 Letter : Fred M. Odena to AM 1898/0818
- UPEL 61/36 Letter : W.J. O'Connor to AM 1898/0819
- UPEL 61/36 Letter : Joseph P. O'Reilly to Brother Hugh 1898/0823
- UPEL 61/36 Letter : Hugh O'Neill to AM 1898/0823
- UPEL 61/36 Letter : Fred M. Odena to AM 1898/0827
- UPEL 61/36 Letter : J.J. O'Connor to AM 1898/0829
- UPEL 61/36 Letter : Federico Ordetx to AM 1898/0829
- UPEL 61/36 Letter : Federico Ordetx to AM 1898/0830
- UPEL 61/36 Letter : J.J. O'Connor to AM 1898/0831
- UPEL 61/37 Letter : John O'Brien to AM 1898/0901
- UPEL 61/37 Letter : J.J. O'Connor to AM; bill for tuition from Notre Dame for Joseph O'Connor attached 1898/0902
- UPEL 61/37 Letter : H.C. Oberschmidt to NDU; regarding Anthony Hirch 1898/0905
- UPEL 61/37 Letter : J.J. O'Connor to AM 1898/0905
- UPEL 61/37 Letter : P. O'Brien to AM 1898/0906
- UPEL 61/37 Letter : E.D.S. / Oneida Community Limited to Brother Paul Hermit 1898/0906
- UPEL 61/37 Letter : Charles O'Reilly to AM 1898/0908
- UPEL 61/37 Letter : William A. Olmsted to AM 1898/0908
- UPEL 61/37 Letter : E.L. O'Neil to AM 1898/0908
- UPEL 61/37 Letter : J.J. O'Connor to William Hoynes 1898/0908
- UPEL 61/38 Letter : T. O'Sullivan to AM 1898/0909
- UPEL 61/38 Letter : Eugene O'Neal to AM 1898/0910
- UPEL 61/38 Letter : T. O'Sullivan to [?]; regarding J. P. Hayes 1898/0911
- UPEL 61/38 Letter : J.J. O'Connor to AM 1898/0913
- UPEL 61/38 Letter : J.J. O'Connor to AM 1898/0919
- UPEL 61/38 Letter : E.L. O'Neil to AM 1898/0920
- UPEL 61/38 Letter : J.J. O'Connor to AM 1898/0921
- UPEL 61/38 Letter : Woulton House [?] / Ohio Central Lines to Brother Paul Hermit 1898/0928
- UPEL 61/38 Letter : M. O'Sullivan to AM 1898/0928
- UPEL 61/38 Letter : J.J. O'Connor to AM 1898/0929
- UPEL 61/39 Letter : W.W. O'Brien to AM 1898/1001
- UPEL 61/39 Letter : Brother Otto to Brother Paul Hermit 1898/1002
- UPEL 61/39 Letter : J.J. O'Connor to William Hoynes 1898/1003
- UPEL 61/39 Letter : Mrs. N.J. Barter to President UND 1898/1009
- UPEL 61/39 Letter : Anderson Art Company to Brother Paul Hermit 1898/1013
- UPEL 61/39 Letter : M O'Brien and Son to Brother Paul Hermit 1898/1013
- UPEL 61/39 Letter : M O'Brien and Son to Brother Paul Hermit 1898/1014
- UPEL 61/39 Letter : M O'Brien and Son to Brother Paul Hermit 1898/1018
- UPEL 61/39 Letter : M O'Brien and Son to Brother Paul Hermit 1898/1018
- UPEL 61/39 Letter : Burton W. Oliver to AM 1898/1021
- UPEL 61/39 Letter : Charles O'Reilly to AM 1898/1024
- UPEL 61/39 Letter : Mrs. A. [Onken?] to AM 1898/1026
- UPEL 61/39 Letter : Federico Ordetx to AM 1898/1031
- UPEL 61/40 Letter : Patrick O'Brien to AM 1898/1103
- UPEL 61/40 Letter : Federico Ordetx to Brother Paul Hermit 1898/1104
- UPEL 61/40 Letter : Captain William L. Orr to Father Regan 1898/1108
- UPEL 61/40 Letter : Eugene O'Neal to AM 1898/1110
- UPEL 61/40 Letter : Mrs. M. O'Connor to Rev. Father 1898/1114
- UPEL 61/40 Letter : James O'Shaughnessy to AM 1898/1116
- UPEL 61/40 Letter : John Newman to AM 1898/1121
- UPEL 61/40 Letter : Thomas O'Gorman to AM 1898/1123
- UPEL 61/40 Letter : Charles O'Reilly to AM 1898/1130
- UPEL 61/41 Letter : Hugh O'Connor to Dear Rev and Sir 1898/1205
- UPEL 61/41 Letter : A.B. Oechtering to AM 1898/1207
- UPEL 61/41 Letter : Mrs. J.M. Ninnemann to AM; note attached 1898/1209
- UPEL 61/41 Letter : Kate Norton to AM 1898/1213
- UPEL 61/41 Letter : Victor Oberting to AM 1898/1226
- UPEL 61/41 Letter : P.J. Nealy to Rev. and Dear Sir 1898/1228
- UPEL 61/41 Letter : Isaac H. Orr to UND 1898/1228
- UPEL 61/41 Letter : Hugh O'Neil to AM 1898/1228
- UPEL 61/41 Letter : W.H. O'Brien to AM 1898/1229
- UPEL 61/41 Letter : Victor Oberting to UND 1898/1231
- UPEL 61/42 Letter : Draft of letter from AM to Fred Odena no date
- UPEL 61/42 Letter : Francis J. O'Hara to AM no date
- UPEL 61/42 Letter : Mamma [O'Connor] to My dear Eddie no date
- UPEL 61/42 Letter : Mrs. P.H. Fitzgerald to Father Regan no date
- UPEL 61/42 Letter : Robert [Fitzgerald?] to his brother no date [incomplete] no date
- UPEL 61/42 Letter : Parent of Willie Moore to AM 1898/0916
- UPEL 61/42 Letter : list of clothing no date
- UPEL 61/42 Letter : Business Card of Adam A. Reinhart no date
- UPEL 61a/01 Letter : Eliza Allen Starr to [?] no date
- UPEL 61a/01 Letter : Leontine Scherrer to AM no date
- UPEL 61a/01 Letter : M. Shillington to Father Moloney no date
- UPEL 61a/01 Letter : Mrs. M. Schaack to Brother Paul Hermit no date
- UPEL 61a/01 Letter : Joe Ebelhard to [?]; regarding Stauss no date
- UPEL 61a/01 Letter : Ynocencia A. de San Roman to AM 1896/1029
- UPEL 61a/01 Letter : Frances Newton Symmes to AM 1897/0722
- UPEL 61a/01 Letter : Julia Spalding to AM 1897/0803
- UPEL 61a/01 Letter : Frank Christianaer/ Sousa and His Band to AM 1897/0805
- UPEL 61a/01 Letter : George Stuhlfauth to AM 1897/0809
- UPEL 61a/01 Letter : [Frances Newton Symmes?, incomplete] to AM 1897/0810
- UPEL 61a/01 Letter : Ella Shannon to AM 1897/0811
- UPEL 61a/01 Letter : Charles L. Schwartz to AM 1897/0812
- UPEL 61a/01 Letter : T. O'Sullivan to AM 1897/0812
- UPEL 61a/01 Letter : Julia Spalding to AM 1897/0814