This 1892 stereo view of African-Americans picking cotton says “Away down among “de Cotton and de Coons” and appears to say that the photo is from Louisiana.  It is published by Underwood & Underwood, Publishers and says “New York, London, Toronto-Canada, Ottawa-Kansas.  Works and Studios Arlington, N.J. Westwood, N.J.”

Stereoscope is a binocular device through which a pair of monocular images was projected to both eyes in such a way that the optic axes converge at the same angle, which gave the impression of a solid 3D image.