- UPEL 61/26 Letter : Charles Feeley [?] to Rev. Father 1897/0904
- UPEL 61/26 Letter : Thomas Furlong to AM 1897/0907
- UPEL 61/26 Letter : Charles M. Foulks to My Dear Father 1897/0909
- UPEL 61/26 Letter : Henry Friedman to AM 1897/0909
- UPEL 61/26 Letter : A.I. Frank to Brother Paul Hermit 1897/0910
- UPEL 61/26 Letter : Thomas Follen to AM 1897/0911
- UPEL 61/26 Letter : Jeremiah G. Fennessey to AM 1897/0913
- UPEL 61/26 Letter : C.J. Heinl to Dear Nephew Ferdie [F.F.E. Brown] 1897/0914
- UPEL 61/26 Letter : C.J. Heinl to AM; regarding F.F.E. Brown 1897/0914
- UPEL 61/26 Letter : John Frohnenberg to AM; regarding Ferdie Brown 1897/0914
- UPEL 61/26 Letter : Mary J. Flinn to AM 1897/0915
- UPEL 61/26 Letter : Mary J. Flinn to AM; Park Ridge, IL Subdivision Layout plan attached 1897/0917
- UPEL 61/27 Letter : John Frohnenberg to AM; letter from Frohnenberg to AM attached; both regarding Ferdie Brown 1897/0917
- UPEL 61/27 Letter : Mrs. M.A. Fischer to AM 1897/0920
- UPEL 61/27 Letter : M. Funk to UND 1897/0920
- UPEL 61/27 Letter : John J. Fogarty to AM 1897/0920
- UPEL 61/27 Letter : Louis Fox to AM 1897/0921
- UPEL 61/27 Letter : Mrs. E.B. Foulks to AM 1897/0921
- UPEL 61/27 Letter : Sister Ferdinand to AM 1897/0922
- UPEL 61/27 Letter : A.I. Frank to AM 1897/0922
- UPEL 61/27 Letter : John Franey to AM 1897/0922
- UPEL 61/27 Letter : Mary C. Fleming to Superior of Visitors Home 1897/0923
- UPEL 61/27 Letter : Thomas Follen to AM 1897/0924
- UPEL 61/27 Letter : William Flach to AM 1897/0926
- UPEL 61/27 Letter : Mary J. Flinn to AM 1897/0927
- UPEL 61/28 Letter : Manuel R. Otero to President of the UND 1897/1201
- UPEL 61/28 Letter : A.B. Oechtering to AM 1897/1203
- UPEL 61/28 Letter : John Desmond O'Shea to Very Reverend Dear Father 1897/1204
- UPEL 61/28 Letter : Manuel R. Otero to AM 1897/1204
- UPEL 61/28 Letter : P.F. O'Malley to AM 1897/1207
- UPEL 61/28 Letter : T. O'Sullivan to AM 1897/1207
- UPEL 61/28 Letter : N.J. Clifford to AM; regarding Robert O'Neill 1897/1218
- UPEL 61/28 Letter : Martin H. O'Brien to Rev. and Dear Sir 1897/1227
- UPEL 61/28 Letter : Peter O'Rourke to AM 1897/1231
- UPEL 61/29 Letter : Thomas O'Gorman to AM 1898/0105
- UPEL 61/29 Letter : J.J. O'Connor to AM; letter from AM to Joseph O'Connor attached 1898/0105
- UPEL 61/29 Letter : Manuel R. Otero to AM 1898/0107
- UPEL 61/29 Letter : Albert O'Grady to Reverend Father 1898/0107
- UPEL 61/29 Letter : W.J. Onahan to Editor Scholastic 1898/0108
- UPEL 61/29 Letter : Charles O'Reilly to AM 1898/0113
- UPEL 61/29 Letter : Mrs. Edward O'Connor to Rev. Father 1898/0113
- UPEL 61/29 Letter : Benedict J. O'Driscoll to Dear Sir 1898/0116
- UPEL 61/29 Letter : W.F.M. O'Rourke to AM 1898/0117
- UPEL 61/30 Letter : Henry Sturm to AM 1898/0119
- UPEL 61/30 Letter : P. O'Keeffe to AM 1898/0120
- UPEL 61/30 Letter : James O'Neill to AM 1898/0122
- UPEL 61/30 Letter : Brother Otto to Brother Paul Hermit 1898/0123
- UPEL 61/30 Letter : Fred M. Odena to AM 1898/0123
- UPEL 61/30 Letter : P. O'Keeffe to AM 1898/0124
- UPEL 61/30 Letter : T. O'Sullivan to AM 1898/0127
- UPEL 61/30 Letter : W.A. Gibson/ Osgood and Company to Brother Paul Hermit 1898/0128
- UPEL 61/30 Letter : Mrs. E. O'Connor to Rev. Father 1898/0130
- UPEL 61/30 Letter : Fred M. Odena to AM 1898/0131
- UPEL 61/31 Letter : T. O'Sullivan to AM 1898/0208
- UPEL 61/31 Letter : Hugh O'Neill to AM 1898/0208
- UPEL 61/31 Letter : T. O'Sullivan to AM 1898/0210
- UPEL 61/31 Letter : John O'Meara to Editor Ave Maria 1898/0211
- UPEL 61/31 Letter : M. O'Sullivan to AM 1898/0216
- UPEL 61/31 Letter : Manuel R. Otero to AM 1898/0218
- UPEL 61/31 Letter : William O'Malley to [?] 1898/0227
- UPEL 61/32 Letter : J.H. Ochtering to AM; regarding A. Reinhart 1898/0306
- UPEL 61/32 Letter : Mamma [Odena] to My Dear Fred 1898/0309
- UPEL 61/32 Letter : R.C. Olin to AM 1898/0317
- UPEL 61/32 Letter : P.F. O'Malley to AM 1898/0322
- UPEL 61/32 Letter : A.P. O'Malley to AM 1898/0324
- UPEL 61/32 Letter : Federico Ordetx to AM 1898/0325
- UPEL 61/33 Letter : Manuel R. Otero to AM 1898/0401
- UPEL 61/33 Letter : Federico Ordetx to AM 1898/0401
- UPEL 61/33 Letter : Hugh O'Neill to AM 1898/0404
- UPEL 61/33 Letter : Fred M. Odena to AM 1898/0406
- UPEL 61/33 Letter : Fred M. Odena to AM 1898/0409
- UPEL 61/33 Letter : Fred M. Odena to AM 1898/0411
- UPEL 61/33 Letter : F.A. O'Brien to AM 1898/0412
- UPEL 61/33 Letter : Manuel R. Otero to AM 1898/0415
- UPEL 61/33 Letter : Fred M. Odena to AM 1898/0418
- UPEL 61/33 Letter : John F. O'Shea to AM 1898/0421
- UPEL 61/33 Letter : Vincent Opava to AM 1898/0421
- UPEL 61/33 Letter : Henry Sturm to AM 1898/0425
- UPEL 61/33 Letter : Federico Ordetx to AM 1898/0426
- UPEL 61/33 Letter : David O'Leary to Rev. Sir 1898/0428
- UPEL 61/33 Letter : Mrs. E. O'Connor to Dear Sister 1898/0428
- UPEL 61/34 Letter : Fred M. Odena to AM 1898/0503
- UPEL 61/34 Letter : Federico Ordetx to AM 1898/0508
- UPEL 61/34 Letter : David O'Leary to Rev. Sir 1898/0514
- UPEL 61/34 Letter : W.J. Onahan to AM 1898/0514
- UPEL 61/34 Letter : Henry Sturm to AM 1898/0518
- UPEL 61/34 Letter : Henry Sturm to AM 1898/0523
- UPEL 61/34 Letter : T. O'Sullivan to Office N.D. 1898/0524
- UPEL 61/34 Letter : Albert Wright / Oberlin College to President NDU 1898/0524
- UPEL 61/34 Letter : Manuel R. Otero to AM 1898/0525
- UPEL 61/34 Letter : Fred M. Odena to AM 1898/0528
- UPEL 61/34 Letter : F.A. O'Brien to AM 1898/0524
- UPEL 61/34 Letter : F.A. O'Brien to Very Rev. Dear Friend 1898/0530
- UPEL 61/34 Letter : Charles O'Reilly to AM 1898/0531
- UPEL 61/35 Letter : Samuel M. Ordetx to President NDU 1898/0608
- UPEL 61/35 Letter : Alexander P. O'Malley to AM 1898/0609
- UPEL 61/35 Letter : Frank J. O'Hara to AM 1898/0609
- UPEL 61/35 Letter : Manuel R. Otero to AM 1898/0610
- UPEL 61/35 Letter : J. O'Connor to AM 1898/0611
- UPEL 61/35 Letter : Luther W. McConnell to AM 1898/0613