Williamson, H. (1811). Observations on the climate in different parts of America: Compared with the climate in corresponding parts of the other continent. To which are added, remarks on the different complexions of the human race ; with some account of the abrigines of America. Being an introductory discourse to the history of North-Carolina. New York: Printed and sold by T.J. Swords.

Williamson, Hugh. Observations On the Climate in Different Parts of America: Compared With the Climate in Corresponding Parts of the Other Continent. To Which Are Added, Remarks On the Different Complexions of the Human Race ; With Some Account of the Abrigines of America. Being an Introductory Discourse to the History of North-Carolina. New York: Printed and sold by T.J. Swords, 1811.

Williamson, Hugh. Observations On the Climate in Different Parts of America: Compared With the Climate in Corresponding Parts of the Other Continent. To Which Are Added, Remarks On the Different Complexions of the Human Race ; With Some Account of the Abrigines of America. Being an Introductory Discourse to the History of North-Carolina. New York: Printed and sold by T.J. Swords, 1811.