- Conflict in Nature and Life: A Study of Antagonism in the Constitution of Things. for the Elucidation of the Problem of Good and Evil, and the Reconcilation of Optimism and Pessimism
- Class Interests: Their Relations to Each Other and to Government. a Study of Wrongs and Remedies--To Ascertain What the People Should Do for Themselves
- Reforms; Their Difficulties and Possibilities
- Reforms: Their Difficulties and Possibilities
- Class Interests: Their Relations to Each Other and to Government. a Study of Wrongs and Remedies--To Ascertain What the People Should Do for Themselves