"English: Final rolling mill action forming finished steel rails.; English: Underwood & Underwood Stereographs of Manufacturing Industries, Set 6 - Rolling mills for steel, Image 40 - Final rolling mill action forming finished steel rails. These stereographs were created and sold as a set for educational use by Underwood & Underwood, a maker of stereoscopic images and equipment. This set was produced between 1895, when the educational unit was established, and 1921, when the company was sold.; between circa 1895 and circa 1921 date QS:P,+1500-00-00T00:00:00Z/6,P1319,+1895-00-00T00:00:00Z/9,P1326,+1921-00-00T00:00:00Z/9,P1480,Q5727902; Underwood and Underwood Stereographs of Manufacturing Industries, Archives collections, Science History Institute.; "