Theme

•  Agriculture (9)
•  Banks-Finance (15)
•  Chemical fertilizers (3)
•  Chemistry (24)
•  Colonies (15)
•  Concrete (1)
•  Construction (12)
•  Earthenware (1)
•  Electricity (8)
•  Goldsmith (1)
•  Health (1)
•  Metal (42)
•  Mines : coal (263)
•  Mines : gold (428)
•  Mines and quarries (978)
•  Misc. Industries (1)
•  Navigation (1)
•  Oil (21)
•  Paintings, colors (1)
•  Railroads (6)
•  Real estate (3)
•  Religion (1)
•  Salt (1)
•  Schools (1)
•  Textiles (2)
•  Trade (3)
•  Transport (2)
•  Water department (1)
•  Wood, forest (3)