12. Standards of service for local utilities. (Annals, vol. liii, pages 292-306.)
13. The case for municipal ownership. (King, Regulation of Municipal Utilities; Thompson, Municipal Ownership)
14. The case against municipal ownership. (King, Regulation of Municipal Utilities; Porter, Dangers of Municipal Ownership.)
15. Early development of railroads in the United States. (Coman, Industrial History of the United States, pages 232-248; Bogart, Economic History of the United States, chapters xxiv and xxv; Lessons in Community and National Life, Series C, pages 217-233.)
16. Geographical distribution of railroads. (Semple, American History and its Geographic Conditions, chapter xvii.)
17. Combinations in the railroad industry. (Lessons in Community and National Life, Series A, pages 219-224; Bogart, Economic History of the United States, chapter xxix; Johnson, American Railway Transportation, chapter iii.)
18. Rate-making. (Johnson, American Railway Transportation, chapter xx; Bullock, Elements of Economics, pages 212-217.)
19. Physical valuation of the railroads. (Annals, vol. lxiii, pages 182-190.)
20. Railroad regulation and the courts. (Johnson, American Railway Transportation, chapter xxvii.)
21. War-time control of railroads in the United States. (Annals, vol. lxxxvi, all; Dixon, War Administration of the Railways in the United States and Great Britain, part i.)