U.S. National Oceanic and Atmospheric Administration.2010-02-152010-02-151966http://hdl.handle.net/1969.3/20021n.p.Four series of 12 maps of the United States, each 1: 10,000,000, present precipitation data based on the 30-yr period 1931-60.rainfallatmospheric precipitationsclimatological chartsmapsBook