Oscar Baarson was assistant superintendent of the Anaconda Company's East Helena, Montana, plant; Helena City Engineer; district manager for the U.S. War Production Board during World War II, engineer for the State Examiners Office and Lewis and Clark County surveyor. This collection consists of Oscar Baarson's files (1925-1950) concerning his work with the Anaconda Company, the City of Helena, and the State Examiners Office; and a small group of personal papers relating to Baarson's family, private engineering business, and Masonic activities.
Ranney Lyman (b. 1880) was a cadastral surveyor in South Dakota and Montana for the U.S. General Land Office and its successor, the Bureau of Land Management. His papers consist of a biography (1954) and reminiscence (1970) by Lyman's wife Mabel Kelsey Lyman; general correspondence (1916-1953); survey diaries (1913-1950); financial records; and lists (1903-1949) of survey crew members.