Title: W. & B. Douglas' descriptive catalogue and price list of patent pumps, hydraulic rams, chain pumps, garden engines, and other hydraulic machines, hardware, etc. manufactured at their works in Middletown, Connecticut, U.S.A. ... 1875-1876
Subjects: Catalogs, Pumping machinery industry, Pumping machinery, Hand pumps, W. & B. Douglas (Firm)