Patents for Inventions. Part I A.D. 1777-186 and Part II A.D. 1867-1876. Published in London at the Patent Office Sale Branch. 1874 & 1883, xxxvii+72+58 pp, 10.5 x 7.5", cloth binding. Includes an extensive introduction (uncommon in these patent compendiums) on statistics relating to milk production and consumption.
