As of 6/22/2018

Series 112: Oaths of Office and Recommendations Correspondence. 1870-1944.
Secretary of State (RG 28).

1870: August-December2454
1870: January-June2452
1870: July2453
1871: January-May2455
1871: June-December2456
1872: January – 1875: September2457
1875-18762458
18772459
18782460
1879-18872461
18922461
18942461
18962461
1898-18992461
1901-19032461
19052461
19322461
19442461