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Cubes of solidified gum extract described as too soft for manufacturing purposes, exhibited by India Rubber Guttapercha and Telegraph Works Co. Ltd. U.S.A., from Africa, 1871-1920

Cubes of solidified gum extract described as too soft for manufacturing purposes

1871-1920
Lump of eucalyptus gum on wood, from Australia, 1851-1930

Lump of eucalyptus gum on wood

1851-1930
Lump of balata, produce of bullet tree, from Demerara, 1851-1890

Lump of balata

1851-1890