Series one documents the agent/broker work that Kimball did in the Klamath Falls area for major lumber companies other than Weyerhauser Timber Company, his primary employer. These included Day Brothers Lumber Company, C.C. Yawkey Lumber Company, and Alexander-Yawkey Lumber Company. The Alexander-Yawkey Lumber Company files document its start in 1937 and its early operations near Prineville. Series two documents Kimball's agent/broker work for smaller lumber companies and individuals.
Series three consists of personal and work-related correspondence with individuals and organizations. Series four documents some of Kimball's professional activities involving lumber and timber organizations and his role in shaping state and federal legislation affecting the timber and lumber industries. Series five pertains to Kimball's personal investments and tax matters involving his interests. Series six includes photographs separated from the collection's files.