The collection consists of A. John Alt's genealogy research and correspondence. The material mostly dates from the 1970s-1990s. A binder has family trees and some family history. The remaining material is correspondence that John Alt conducted with relatives about genealogy. Folder 3 contains notes written on Albert J. Alt & Son letterhead.

The research mostly covers A. John Alt's family.

Paternal line: Nicholaus Alt (1825-1906); Anna Kautenberger (1832-1903); Albert Joseph Alt (1877-1972)

Maternal line: Mary Augusta Theisen (1882-1955); Anton Theisen (1856-1935) and Augusta Auer (1859-1943).

John included research and notes on Henry Kautenberger and Elizabeth Hettinger and several of their descendants, including Peter Kautenberger (1843-1901), Mary Kautenberg Vollpert (1834-1908), Elizabeth Kautenberg Yakel (d 1905) and Margaret Kautenberger Koch (b 1837).

Also included is research on A. John's wife's family: Rosemarie Armock (1911-1995).