- Labor Among Primitive Peoples, Showing the Development of the Obstetric Science of Today, from the Natural and Instinctive Customs of All Races, Civilized and Savage, Past and Present
- Plantae Lindheimerianae: An Enumeration of F. Lindheimer's Collection of Texan Plants, with Remarks and Descriptions of New Species, Etc
- The Cause of Race Decline Is Not Education
- Campbell's New Atlas of Missouri ?with Descriptions Historical, Scientific, and Statistical /Maps Constructed and Drawn on the Polyconic Projection by R.A. Campbell
- Reports Upon the Botanical Collections Made in Portions of Nevada, Utah, California, Colorado, New Mexico and Arizona: During the Years 1871, 1872, 1873, 1874, and 1875