Cincinnati Chamber of Commerce. Impartial Committee on Workmen's Compensation Insurance & Martin, H. D. (1923). Study of workmen's compensation insurance laws and service: Monopoly or competition : with recommendations by the Impartial Committee on Workmen's Compensation Insurance to the Cincinnati Chamber of Commerce, adopted by the board of directors of the Cincinnati Chamber of Commerce. [s.n.].

Cincinnati Chamber of Commerce. Impartial Committee on Workmen's Compensation Insurance and H. D. Martin. Study of Workmen's Compensation Insurance Laws and Service: Monopoly or Competition : With Recommendations by the Impartial Committee on Workmen's Compensation Insurance to the Cincinnati Chamber of Commerce, Adopted by the Board of Directors of the Cincinnati Chamber of Commerce. Cincinnati, Ohio: [s.n.], 1923.

Cincinnati Chamber of Commerce. Impartial Committee on Workmen's Compensation Insurance and H. D. Martin. Study of Workmen's Compensation Insurance Laws and Service: Monopoly or Competition : With Recommendations by the Impartial Committee on Workmen's Compensation Insurance to the Cincinnati Chamber of Commerce, Adopted by the Board of Directors of the Cincinnati Chamber of Commerce. [s.n.], 1923.