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The Butler mss., 1835-1937, includes papers, 1877-1937, of Amos William Butler, 1860-1937, zoologist, anthropologist, and sociologist, and a few papers, 1835-1871, of his father, William Wallace Butler, 1810-1903, merchant and farmer.

The Latin American mss. --Mexico II, 1560-1940, consists of individual items acquired separately either as a gift, purchase, transfer, or removal from a variety of sources, complementing the materials in the Latin American mss. Mexico collection. Additions continue to be made.

The Latin American mss. Peru, 1535-1929, consist of over 6500 documents which trace the historical, economic and social development of what is presently known as Peru, with lesser coverage of Argentina, Bolivia, Chile and Ecuador.

The U.S. History mss., 1612-1977, consist of individual items acquired separately either as a gift, purchase, transfer, or removal from a variety of sources, relating to the United States. Additions continue to be made.