|The Branner Library contains about 125,000 volumes, including 2000 serial titles. Its collections include current and retrospective materials in climatology, earth systems/environmental earth sciences, economic geology, geochemistry, geology, geophysics, hydrogeology, marine geology/ocean margins, petroleum engineering, petroleum geology, seisomology/earthquakes and soils. The collection also includes retropsective collections in invertebrate paleontology, exploration, and mining. The library is a depository for the U.S. Geological Survey (USGS) and the California Geological Survey. The 270,000 sheet map collections are located on the mezzanine of the library. The collection includes maps on a wide range of social science and humanities topics; there is a strong collection of geological, seismological, hydrological, natural hazards, and natural resources maps. The collection also includes a complete set of the topographic quadrangles of the USGS, as well as topographic maps from around the world.