Letters Sent to Superintendents of Lights, 1853 – 1894
Volume 1 – 1853 – 1854 (no index)
Volume 2 – April – Sept. 1856 (partial volume, no index)
Volume 3 – 1856 – 1857 (no index)
Volume 4 – 1857 – 1858 (no index)
Volume 5 – 1858 – 1859 (no index)
Volume 7 – 1860
Volume 6 – 1861 – 1862 (no index)
Volume 8 – 1862 – 1865
Volume 9 – 1866 – 1867
Volume 10 – 1874 – 1879
Volume 11 – 1879 – 1889
Volume 12 – 1890 – 1894
Press copies / Indexed:
Box 1 – July – Oct. 1873 (Letters to Inspectors for Districts 1 – 13)
July 1874 – June 1876 (Letters to Superintendents)
Box 2 – March – May 1873 (Letters to District Engineers)
Box 3 – 1876 – 1877
Box 4 – 1879 – 1884 ?
Box 5 – 1881 – 1884
Box 6 – 1884 – 1894