| Stephen J. Sedgwick Yosemite Valley. 1879-1880 Catalogue page, detail Archive.org LL/91675 Published in Announcement of Prof. S. J. Sedgwick's illustrated course of lectures and catalogue of stereoscopic views of scenery in all parts of the Rocky and Sierra Nevada mountains: between Omaha and San Francisco, Fouth Edition, (Newtown, NY: S.J. Sedgwick), unpaginated
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