TY - CONF T1 - The Callendar Sunshine Recorder and Some of the World-Wide Problem to Which This Instrument Can Be Applied T2 - Second Pan-American Scientific Conference Y1 - 1916 A1 - Douglass, A.E. KW - calendar KW - callendar KW - Douglass KW - historic KW - papers KW - sunshine recorder JF - Second Pan-American Scientific Conference ER -