- MLEO S4/210 Recipient : Leopoldine Society (Dr?) 1903/0425
- MLEO S4/211 Author : von Werner, J. (Austro-Hungarian For.Affrs Min,Vienna) 1857/1206
- MLEO S4/211 Recipient : Rauscher, Joseph Othmar (Cardinal Abp of Vienna) 1857/1206
- MLEO S4/212 Author : Rauscher, Joseph Othmar (Cardinal Abp of Vienna) 1858/0223
- MLEO S4/212 Recipient : von Werner, J. (Austro-Hungarian For.Affrs Min,Vienna) 1858/0223
- MLEO S4/213 Author : Mangold, Adam (Father,CR-Provincial) 1858/0112
- MLEO S4/213 Recipient : Rauscher, Joseph Othmar (Cardinal Abp of Vienna) 1858/0112
- MLEO S4/214 Author : Kuczynsky, Ev.? (Austrian Ambssdr to Brazil-in Weiden) 1904/1117
- MLEO S4/214 Recipient : Leopoldine Society 1904/1117
- MLEO S4/215 Author : Ernser, Joseph (Fr-Rio Negro-State of Parana, Brazil) 1905/0210
- MLEO S4/215 Recipient : Leopoldine Society 1905/0210
- MLEO S4/216 Author : Heggens, Wunibalda (Sr,SCC-for Superior-Paderborn) 1896/0821
- MLEO S4/216 Recipient : Leopoldine Society 1896/0821
- MLEO S4/217 Author : Heggens, Wunibalda (Sister,SCC-Paderborn, Westphalia) 1896/0928
- MLEO S4/217 Recipient : Leopoldine Society 1896/0928
- MLEO S4/218 Author : Stroebele, Albert (Fr-Island of St.Andreas, Columbia) 1902/0201
- MLEO S4/218 Recipient : Leopoldine Society 1902/0201
- MLEO S4/219 Author : Clancy, William (Apostolic Vicar of British Guinea) 1837/1226
- MLEO S4/219 Recipient : Milde, Vincent Eduard (Archbishop of Vienna) 1837/1226
- MLEO S4/220 Author : Clancy, William (Apostolic Vicar of British Guinea) 1840/1226
- MLEO S4/220 Recipient : Milde, Vincent Eduard (Archbishop of Vienna) 1840/1226
- MLEO S4/221 Author : Clancy, William (Apostolic Vicar of British Guinea) 1841/0130
- MLEO S4/221 Recipient : Milde, Vincent Eduard (Archbishop of Vienna) 1841/0130
- MLEO S4/222 Author : MacDonnell, Daniel (Bp of Olymp-Vic Apos of Trinidad) 1837/0611
- MLEO S4/222 Recipient : Society of the Propagation of the Faith (Lyon) 1837/0611
- MLEO S4/223 Author : Smith, Richard Patrick (Coadj of Apos Vic of Trinidad) 1840/04?
- MLEO S4/223 Recipient : Altieri, Louis (Crd-Tit. Abp of Ephesus-Nuntio-Vienna) 1840/04?
- MLEO S4/224 Author : Smith, Richard Patrick (Coadj of Apos Vic of Trinidad) 1840/04?
- MLEO S4/224 Recipient : Altieri, Louis (Crd-Tit. Abp of Ephesus-Nuntio-Vienna) 1840/04?
- MLEO S4/225 Author : Smith, Richard Patrick (Coadj of Trinidad) 1840/0530
- MLEO S4/225 Recipient : Milde, Vincent Eduard (Abp of Vienna-LS Secretary) 1840/0530
- MLEO S4/226 Author : MacDonnell, Daniel (Vicar Apostolic of Trinidad) nd
- MLEO S4/226 Recipient : Smith, Richard Patrick (Coadjutor of Trinidad) nd
- MLEO S4/227 Author : unknown] , J.C. (CSsR-Vic.Apost. of Surinam, Vienna) 1909/1017
- MLEO S4/227 Recipient : Chancery of Vienna 1909/1017
- MLEO S4/228 Author : Milde, Vincent Eduard (Archbishop of Vienna) 1850/0821
- MLEO S4/228 Recipient : Benvenuti, Johann? (Leopoldine Society Treasurer) 1850/0821
- MLEO S4/229 Author : Singer (Secretary-Chancery of Brixen) 1854/1020
- MLEO S4/229 Recipient : Leopoldine Society 1854/1020
- MLEO S4/230 Author : Habtmann, G. (President-Chancery of Brixen) 1854/0914
- MLEO S4/230 Author : Singer (Secretary-Chancery of Brixen) 1854/0914
- MLEO S4/230 Recipient : Leopoldine Society 1854/0914
- MLEO S4/231 Author : von Roverdo, Von Vilas (Father-Vinzenz, Trent) 1867/0918
- MLEO S4/231 Recipient : Leopoldine Society (Archbishop's Directors) 1867/0918
- MLEO S4/232 Document : Record of Donation for Travel Expenses 1867/1026
- MLEO S4/232 Author : Angerer, Eduard (Leopoldine Society Secretary) 1867/1026
- MLEO S4/232 Subject : Hillmer (Theologian-Gratz) 1867/1026
- MLEO S4/232 Subject : Toplak (Theologian) 1867/1026
- MLEO S4/233 Author : Mohr, M. (Father-Bregenza) 1868/0420
- MLEO S4/233 Recipient : Kueng, A.G. (Father-Kobelwald-Archdiocese of Brixen) 1868/0420
- MLEO S4/234 Author : Gross, Anton (Father-Vienna) 1874/0212
- MLEO S4/234 Recipient : Leopoldine Society 1874/0212
- MLEO S4/235 Author : Taliani, C. (Auditor of Apostolic Nuntio-Paris) 1877/0420
- MLEO S4/235 Recipient : Kornheisl, Franz (Canon-Director-Chancery of Vienna) 1877/0420
- MLEO S4/236 Document : Note of Receipt of Money for Missionary 1877/0728
- MLEO S4/236 Author : Kornheisl, Franz (Canon-Director-Chancery of Vienna) 1877/0728
- MLEO S4/236 Subject : Tokarsky, Stanislaus (Fr-Missionary) 1877/0728
- MLEO S4/237 Author : Pogacar, Chrysostomus (Archbishop of Laibach) 1878/0416
- MLEO S4/237 Recipient : Leopoldine Society 1878/0416
- MLEO S4/238 Author : Zvacek, Franz (Father-Missionary-KS) 1886/0716
- MLEO S4/238 Recipient : Leopoldine Society 1886/0716
- MLEO S4/239 Author : Rohan, Franz (Vienna) 1886/0726
- MLEO S4/239 Recipient : Leopoldine Society 1886/0726
- MLEO S4/240 Author : Bachmaier, Sebastian (Father-Vienna) 1897/1130
- MLEO S4/240 Recipient : Chancery of Vienna 1897/1130
- MLEO S4/241 Author : Jiranek, Father (Father-Vienna) 1898/1122
- MLEO S4/241 Recipient : Leopoldine Society 1898/1122
- MLEO S4/242 Author : Grund, Wenzel (Father-Archdiocese of Prague) 1905/0315
- MLEO S4/242 Recipient : Leopoldine Society 1905/0315
- MLEO S4/243 Author : Hanak, Josef nd
- MLEO S4/243 Recipient : Leopoldine Society nd
- MLEO S4/244 Author : Bachmaier, Sebastian (Father-Vienna) 1905/1025
- MLEO S4/244 Recipient : Leopoldine Society 1905/1025
- MLEO S4/245 Author : Jiranek, Father (Father-Vienna) 1898/1123
- MLEO S4/245 Recipient : Leopoldine Society 1898/1123
- MLEO S4/246 Author : Stroehle, Benedikt (Father-Chaplain?) nd
- MLEO S4/246 Recipient : Leopoldine Society nd
- CLEO : Leopoldinen-Stiftung im Kaisertume Osterreich: Photostats
- PLEO : Leopoldinen-Stiftung im Kaisertume Osterreich: Printed Material