A very scarce work, the study by Lauber was really the first significant and substantive exploration of the exploitation of Native American during the early Colonial and post-Colonial era in a version of chattel slavery. Because of the 19th century occupation with the enslavement of Africans [by quantity, vastly larger], the enslavement of other populations, i.e. the Native Americans, Mexicans, and Chinese were often overlooked.

If Helen Hunt Jackson's Century of Dishonor [1881] exposed the chronic treaty breaking, bad faith, and genocide of Native Americans, Lauber rounds out the narrative by reminding us of their enslavement story. 

Lauber, Almon Wheeler. Studies in History, Economics and Public Law Edited by the Faculty of Political Science of Columbia University Volume LVI Number 3, Whole Number 134. Indian Slavery in Colonial Times Within the Present Limits of the United States. New York. Columbia University. 1913. 352pp.

A good + copy, bound in cloth, hinges shaken, but generally solid. Pages are generally bright, and the title page has been repaired at the top of the sheet.