The fonds reflects B.C. Tanners' business interests and professional work in the oil industry. The fonds pertains to his position as President of Lassiter Kuma Oils Ltd. and his position as an accountant with B.C. Tanner and Co. and consists of the records of Lassiter Kuma Oils Ltd. as well as the preceding bodies of Lassiter Kuma Oils Ltd. including financial statements, minutes, certificates of incorporation, agreements, and reports of Lassiter Petroleum Ltd., Lassiter Oil Syndicate, Kuma Oils Ltd., Lobitos Oil Fields Canada Ltd., Horn River Resources Ltd., and Round Valley Oil Co., as well as maps and reports related to the arctic petroleum industry. The fonds also includes materials reflecting his agricultural activities and includes notices, certificates, and a cattle inventory relating to the raising of Charolais Cattle, and an account of life growing up in Magrath, Alberta.Tanner, B.C.