Letters Sent to the Secretary of the Treasury, 1852 – 1910
Volume 1 (No. 1) October 12, 1852 – Dec. 31, 1854
Volume 2 1855 – 1857 (indexed)
Volume 3 (No. 3) July 1, 1857 – June 30, 1859
Volume 4 (No. 4) 1859 – 1861 (indexed)
Volume 5 (No. 5) 1861 – 1863 (indexed)
Volume 6 July 2, 1863 – December 30, 1864 (indexed)
Volume 7 Oct. 22, 1864 – May 26, 1866 (indexed)
Volume 8 July 10, 1868 – June 22, 1871 (indexed)
Volume 9 July 1, 1871 – Dec. 31, 1872 (indexed)
Volume 10 June 19, 1877 – Aug. 19, 1878 (indexed)
Volume 11 Jan. 5, 1880 – April 14, 1881 (no index)
Volume 12 April 15, 1881 – June 22, 1882 (no index)
Volume 13 June 23, 1882 – Oct. 1, 1883 (no index)
Volume 14 Oct. 1, 1883 – Jan. 15, 1885 (no index)
Volume 15 Feb. – August 1886
Volume 16 May – Dec. 1887 (no index)
Volume 17 May 1888 – Jan. 1889 (no index)
Volume 18 Jan 1892 – Feb. 1893 (no index)
Volume 19 Feb. 1893 – May 1894 (no index)
Boxes contain bound press copies with subject index in each volume
Box 1 1874 – 1876
Box 2 1876 – 1877
Box 3 1877
Box 4 1878
Box 5 1878 – 1879
Box 6 1879 – 1880
Box 7 1880 – 1881
Box 8 1881 – 1882
Box 9 1883
Box 10 1883 – 1884
Box 11 1884
Box 12 1885
Box 13 1886
Box 14 1886
Box 15 1886
Box 16 1886 – 1887
Box 17 1887
Box 18 1887
Box 19 1888
Box 20 1888
Box 21 1888
Box 22 1889
Box 23 1889
Box 24 1889
Box 25 1889
Box 26 1890
Box 27 1890
Box 28 1891
Box 29 1891
Box 30 1892
Box 31 1892 – 1893
Box 32 July – Dec. 1893; July – Dec. 1896
Box 33 July – Dec. 1894; July – Dec. 1895
Box 34 Jan. – June 1896; July – Dec. 1895
Box 35 Jan. – June 1897; Jan. – June 1894
Box 36: July – Dec. 1897
Box 37 1898
Box 38 1898
Box 39 1899
Box 40 1899 – 1900
Box 41 1900
Box 42 1900
Box 43 1901
Box 44 1901
Box 45 1901
Box 46 1902
Box 47 1903
Box 48 1902
Box 49 Jan – Feb 1903
Box 50 May – June 1903
Box 51 July – Sept 1903
Box 52 Oct – Dec 1903
Box 53 Jan – Feb 1904
Box 54 March – April 1904
Box 55 May – June 1904
Box 56 July – Sept 1904
Box 57 Sept – Oct 1904
Box 58 Nov – Dec 1904
Box 59 Jan – March 1905
Box 60 March – April 1905
Box 61 May – June 1905
Box 62 July – Sept 1905
Box 63 Oct 1905 – Feb 1906
Box 64 March – June 1906
Box 65 July – Aug 1906
Box 66 Sept – Oct 1906
Box 67 Nov – Dec 1906
Box 68 Jan – Feb 1907
Box 69 March – April 1907
Box 70 May – July 1907
Box 71 Aug – Sept 1907
Box 72 Oct – Nov 1907
Box 73 Dec 1907 – March 1908
Box 74 April – June 1908
Box 74 April – June 1908