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I. General comparative analysis, and public aids to scheduled air transportation. pt. I. General comparative analysis. pt. II. Public aids to scheduled air transportation. 1940
II. Aids to railroads and related subjects. pt. I. Aids to railroads. pt. II. The taxation of railroads. pt. III. Nonproductive expenditures of railroads. 1938.
III. Public aids to transportation by water. pt. I. Waterway improvements and related aids. pt. II. Government transportation operations on inland waterways. An analysis of the inland waterways corporation. pt. III. The Panama canal. 1939.
IV. Public aids to motor vehicle transportation. An analysis of highway and street costs and motor vehicle user payments. 1940

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