- CDBL 3/18 Folder : Letters received by Bouchet and McCloskey 1881-1882
- CDBL 4/01 Folder : Letters received by Bouchet and McCloskey 1881-1882
- CDBL 4/02 Folder : Letters received by Bouchet and McCloskey 1882/6-7
- CDBL 4/03 Folder : Letters received by Bouchet and McCloskey 1882-1884
- CDBL 4/04 Folder : Letters received by Bouchet and McCloskey 1882/8-10
- CDBL 4/05 Folder : Letters received by Bouchet and McCloskey 1882-1883
- CDBL 4/06 Folder : Letters received by Bouchet and McCloskey 1883/1-6
- CDBL 4/07 Folder : Letters received by Bouchet and McCloskey 1883/2-9
- CDBL 4/08 Folder : Letters received by Bouchet and McCloskey 1884-1885
- CDBL 4/09 Folder : Letters received by Bouchet and McCloskey 1884/3-10
- CDBL 4/10-39 Subseries : Bouchet Book [letters received by Michael Bouchet] 1858-1867
Letters received by Michael Bouchet with transcriptions of each. The letters were acquired from the Archives of the Sisters of Loretto in Louisville, who also wrote the transcriptions.
- CDBL 4/10 Folder : Letters sent by P. J. Lavialle 1863-65,nd
- CDBL 4/11 Folder : Letters sent by Mother M. Ignatius Ward, Convent of the Good Shepherd 1863-1866
- CDBL 4/12 Folder : Letters sent by M. Chazal 1859-1867
- CDBL 4/13 Folder : Letters sent by F. Chambige 1862-66,nd
- CDBL 4/14 Folder : Letters sent by Athanasius Aud 1861-1866
- CDBL 4/15 Folder : Letters sent by David Russell 1865-1867
- CDBL 4/16 Folder : Letters sent by A. J. Van and B. Sestini 1866
- CDBL 4/17 Folder : Letters sent by Mother Columba Carroll 1864-1867
- CDBL 4/18 Folder : Letters sent by C. Labourier 1862,1866
- CDBL 4/19 Folder : Letters sent by L. Hoste 1863-1864
- CDBL 4/20 Folder : Letters sent by M. J. Spalding 1860, nd
- CDBL 4/21 Folder : Letters sent by E. O'Driscole 1858-1861
- CDBL 4/22 Folder : Letters sent by Sister Catharine, St. Ann's Asylum 1866
- CDBL 4/23 Folder : Letters sent by James Bent 1863-1866
- CDBL 4/24 Folder : Letters sent by B. M. Benedict and M. Benoit, Gethsemani, Kentucky 1864-1865
- CDBL 4/25 Folder : Letters sent by H. A. Livers 1860-1861
- CDBL 4/26 Folder : Letters sent by Augustine Degauquier 1860-1865
- CDBL 4/27 Folder : Letters sent by William J. Kinsella 1862,1864
- CDBL 4/28 Folder : Letters sent by Michael Power 1863
- CDBL 4/29 Folder : Letters sent by Mary Miles 1863-1864
- CDBL 4/30 Folder : Letters sent by Joseph F. Edwards 1865,nd
- CDBL 4/31 Folder : Letters sent by Brother David 1863
- CDBL 4/32 Folder : Letters sent by W. J. Dunn and E. J. Durbin, Sacred Heart Church, Union County, Kentucky 1863,1864
- CDBL 4/33 Folder : Letters sent by Mary L. Troy nd
- CDBL 4/34 Folder : Letters sent by Benziger Brothers 1863.1866
- CDBL 4/35 Folder : Letters sent by Benedict J. Spalding 1864/0704
- CDBL 4/36 Folder : Letters sent by A. Zollin 1867/0308
- CDBL 4/37 Folder : Letters sent by Bouchet family in France 1866
- CDBL 4/38 Folder : Letters sent to Michael Bouchet 1858-66,nd
- CDBL 4/39 Folder : Letters sent to Michael Bouchet [?] 1860-67,nd
- CDBL 4-05 Subseries : Bishop Benedict Flaget to Saint Sulpice 1806-1858
Bound volumes of photocopied letters. Volume 4 includes an index.
- CDBL 4/40 Folder : Bishop Benedict Flaget to Saint Sulpice, Volume 1 1806-1818
- CDBL 5/01 Folder : Bishop Benedict Flaget to Saint Sulpice, Volume 2 1816-1832
- CDBL 5/02 Folder : Bishop Benedict Flaget to Saint Sulpice, Volume 3 1832-1833
- CDBL 5/03 Folder : Bishop Benedict Flaget to Saint Sulpice, Volume 4, Supplement and Index 1814-1816
- CDBL 5/04-21 Subseries : Named correspondence 1819-1961
Letters of prominent figures in the history of the Church in the U.S., including S. T. Badin, Martin Spalding, and M. Chazal arranged by name and, in some measure, by importance or chronology.
- CDBL 5/04 Folder : S. T. Badin 1819,1836,
- CDBL 5/05 Folder : Letters sent by Joseph Haseltine to I. A. Reynolds 1843
- CDBL 5/06 Folder : Book used as letterbook by J. Haseltine then as a Baptismal register at Raywick, Kentucky 1825-1871
- CDBL 5/07 Folder : Martin J. Spalding 1855-68,nd
- CDBL 5/08 Folder : Benedict J. Spalding 1850-67,nd
- CDBL 5/09 Folder : Letters sent by M. Chazal 1863-1873
- CDBL 5/10 Folder : Peter J. Lavialle 1861-1867
- CDBL 5/11 Folder : Denis O'Donaghue 1910-1920
- CDBL 5/12 Folder : John A. Floersh 1925-1961
- CDBL 5/13 Folder : Letters sent by John Hill, Secretary 1903-1906
- CDBL 5/14 Folder : Letters received by John Hill, Secretary 1903-06,nd
- CDBL 5/15 Folder : Thomas Joyce, Pastor, St. Patrick Church, Louisville 1859-1863
- CDBL 5/16 Folder : Letters sent by George Schuhmann 1895-1926
- CDBL 5/17 Folder : Letters received by George Schuhmann 1890s
- CDBL 5/18 Folder : Letters received by George Schuhmann 1900-1914
- CDBL 5/19 Folder : Letters received by George Schuhmann nd
- CDBL 5/20 Folder : Propaganda Fide 1830-1907
- CDBL 5/21 Folder : Apostolic Delegation 1896-1917
- CDBL 5/22-32 Subseries : General Correspondence 1825-1930s
Correspondence of people in and to the Archdiocese, often unidentified. Arranged chronologically.
- CDBL 5/22 Folder : Correspondence 1825-1840s
- CDBL 5/23 Folder : Correspondence 1850s
- CDBL 5/24 Folder : Correspondence 1860s
- CDBL 5/25 Folder : Correspondence 1870s
- CDBL 5/26 Folder : Correspondence 1880s
- CDBL 5/27 Folder : Correspondence 1890s
- CDBL 5/28 Folder : Correspondence 1900s
- CDBL 5/29 Folder : Correspondence 1910s
- CDBL 5/30 Folder : Correspondence 1920-30s
- CDBL 5/31 Folder : Correspondence nd
- CDBL 5/32 Folder : Envelopes