13. Taxation in American cities. (Annals, vol. xxviii, pages 155- 172.)
14. Personal taxes. (Fetter, Modern Economic Problems, chapter xviii.)
15. The poll tax. (Bullock, Selected Articles on Public Finance, chapter x.)
16. Breakdown of the general property tax. (Taussig, Principles of Economics, vol. ii, chapter lxix.)
17. Protection against improper state taxation. (Young, The New American Government and its Work, chapter xxv.)
18. Double taxation. (Seligman, Essays in Taxation, chapter iv.)
19. The corporation tax. (Seligman, Essays in Taxation, chapters vi and vii.)
20. Separation of state and local revenues. (Seligman, Essays in Taxation, chapter xi; Bullock, Selected Articles on Public Finance, pages 445-460.)
21. Excises. (Plehn, Introduction to Public Finance, chapter vi.)
22. Customs duties. (Plehn, Introduction to Public Finance, chapter vii.)