Journals (1901-1903) kept by Hack while serving as a U.S. Army surgeon in the Philippines providing his impressions and experiences in Luzon, including Manila, and especially at Camp Vicars in the interior of Mindanao under the command of Major John J. Pershing. Hack describes social customs, relations between the U.S. Army and the local population, and public health problems. Also includes manuscripts of portions of the Koran in Arabic (circa 19th century) and of an excerpt of a Maranao oral literary epic, "Darangen," in Maranao written in Arabic script. Includes a summary of an assessment of the manuscripts by Richard J.H. Gottheil incorporating comments by "Kelekian," probably Dikran G. Kelekian. Also includes a listing of Moro artifacts exhibited in the American Museum of Natural History, New York, N.Y., in the 1920s.