The following paper is a continuation of records of the same kind by Prof. Keeler and myself and it brings the list up to the end of the year 1891. It records all the shocks observed or felt on Mount Hamilton, and all those reported to the Lick Observatory by letter, as well as newspaper reports of such earthquakes as occurred in the state during that year. No systematic examination of the newspapers has been made, however, and reports may have escaped notice.
US Department of the Interior and Holden, Edward S., "Earthquakes in California in 1890 and 1891" (1892). Federal Documents. 14.