Assayers' and Chemists' Supplies: Bausch & Lomb Supplement
Publisher: The Mine and Smelter Supply Company
Published: 1921
Number of pages: 20
Notes: This appears to be a supplemental insert to the Mine and Smelter Supply Company's catalog "Assayers' and Chemists' Supplies: Scientific Instruments," catalog No. 54, from 1920. Early writing on this document indicates that this particular supplement was published in 1921.