Most items can be found using a combination of United States and History.
American History books are mostly located in the general area of Dewey number 973, which are almost at the East side of the Markosian library, upstairs on the top floor.
Hard Road West: History and Geology along the Gold Rush Trail by Keith H. Meldahl. Get it at: 978.02 M482H in the General Collection at Redwood Campus Library