The Slave Trade, Domestic and Foreign Why It Exists, and How It May Be Extinguished

Agricola: A study of agriculture and rustic life in the Greco-Roman world from the point of view of labour

William Emerton Heitland

Slavery as an industrial system: Ethnological researches.

H. J. Nieboer

Collected Articles of Frederick Douglass

Frederick Douglass

A Plea for Captain John Brown Read to the citizens of Concord, Massachusetts on Sunday evening, October thirtieth, eighteen fifty-nine

Henry David Thoreau

Studies on Slavery, in Easy Lessons

John Fletcher

The rise, progress, and phases of human slavery How it came into the world and how it shall be made to go out

James Bronterre O'Brien