This collection is arranged in three subgroups. The Libby Lumber Company/Libby Yards Company subgroup contains general correspondence (1917-1921); court papers (1923-1924); financial records (1914-1936); and legal documents (1922-1934).

The Monarch Lumber Company subgroup includes general correspondence (1921-1961); court papers (1925-1930); financial records (1928-1961); legal documents (1923-1958); minutes (1921-1936) for board of directors, executive committee, and stockholders meetings; organizational materials (1921-1923); reports (1922-1936); and miscellany.

The Building Service, Inc. subgroup includes general correspondence (1937-1961); financial records (1933-1960) including annual reports and taxes; legal documents (1916-1961); minutes (1933-1961) of board of directors and stockholders meetings; organizational materials (1933-1961); reports (1935-1959); and miscellany.