Stereo cards American industry c. 1900

Lot with 50 stereo cards, Underwood & Underwood publishers, New York/ London etc., c. 1900. Incl. "Folding and packing paper made from pulp of fest trees, Marinette, Wisconsin", "Making up butter in pound packages, at a modal dairy", "Big Tree Logging, California" and "In the hold of a steamer uploading iron ore, Cleveland".