In archival terminology, (or MSS) is the standard abbreviation for "Manuscripts." The specific 7z suffix likely denotes a specific sub-series, album, or box number within the Society's vast cataloging system. For researchers and historians, this code is the "key" to locating specific photographic prints and primary source documents that track the mechanization of the world’s food supply.
: Photographs and documents illustrating early 20th-century efforts to educate farmers, such as the Diversification of Livestock in Alabama (1915), which features students at the Montgomery State Normal School. MSs.7z
The series is part of one of the largest and most complete records of American agricultural and industrial history. It documents the evolution of the International Harvester Company (IHC) and its predecessor, the McCormick Harvesting Machine Company. In archival terminology, (or MSS) is the standard