Meade, Richard K. (Richard Kidder). “Fig. 72: McKenna Mechanically Operated Agate Mortar and Pestle.” The Design and Equipment of Small Chemical Laboratories. Chicago, Illinois: The Chemical Engineer Publishing Co., 1908. QD51 .M43 1908. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4elmh5u.
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