Series of Debates
| 130 | Controversy on Christianity. Ingersoll and Gladstone. | |
| 43 | Marriage and Divorce. Horace Greeley and Robert Owen. | |
| 208 | Debate on Birth Control. Mrs. Sanger and Winter Russell. | |
| 129 | Rome or Reason. Ingersoll and Manning. | |
| 122 | Spiritualism. Conan Doyle and McCabe. | |
| 171 | Has Life Any Meaning? Frank Harris and Percy Ward. | |
| 206 | Capitalism vs. Socialism. Seligman and Nearing. | |
| 234 | McNeal-Sinclair Debate on Socialism. |