London, England and chicago, Illinois: Microscope Publications 1975. xi, 147 pages. 8vo. Original yellow paper boards, with a touch of wear and minor soiling to the boards. No dust jacket as issued. Clean internally. Near Fine. Boards. 
One of those books we use regularly in our antique scientific instrument business.
A useful reference book on early American Microscope manufacturers, of use to collectors, institutions, historians, and dealers. With chapters on Charles A Spencer and his successors, The Grunow Brothers of New Haven, Joseph Zentmayer of Philadelphia, Robert B. Tolles and the Boston Optical Works, Chicago Makers (Bulloch and McIntosh), Bausch and Lomb of Rochester NY, Acme Optical Works of Lancaster PA and James W. Queen of Philadelphia, and a last chapter on another 20 or so makers or designers.