The Montana Archaeological Society records (1958-2019) contain: organizational records (1958-2000), such as articles of incorporation, by-laws, and minutes; general correspondence (1958-1999) relating to the organization’s day-to-day activity, interaction with members and journal subscribers, financial matters, and a variety of programs and events; financial records (1958-2000), including bank statements, income and expense reports, as well as annual budgets; membership records (1958-1999) mostly containing lists of members, in the instances when such lists were not available member registration forms were retained in their place; and several subject files relating to the journal Archaeology in Montana, the annual meeting of members, and documents regarding the Archaeology Week program. The collection also contains all of the records belonging to the Montana Archaeological Association, which officially merged with the Montana Archaeological Society in 1996. The Montana Archaeological Association records (1980-1996) include: organizational records (1980-1996), such as by-laws and minutes; financial records (1980-1995) including bank statements; general correspondence (1980-1996), relating to the various programs sponsored by the group; membership records (1980-1989); and project and subject files relating to various tasks undertaken by the group in relation to lobbying and outreach.