The Archaeological Field Diaries of Sylvanus Griswold Morley, 1914-1916 The Archaeological Field Diaries of Sylvanus Griswold Morley: The Spy Years, 1917-1918 The Archaeological Field Diaries of Sylvanus Griswold Morley: Excavations at Quirigua, 1912 and 1919 The Archaeological Field Diaries of Sylvanus Griswold Morley: Explorations in Petén, 1920-1921 Also see: The Morley-Shook Map of the Carnegie Institution of Washington Central American Expeditions, 1914–1934, by Christopher Ward and Prudence M. Rice.