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China-clay (kaolin) : the mineral industry of the British empire and foreign countries / Imperial institute.
- His Majesty's Stationery Office,
- 1931.
- London :
-
Tea : reports of the Imperial economic committee
- His Majesty's Stationery Office,
- 1931.
- London :
-
House of Commons.
- 328.41'072
- His Majesty's Stationery Office,
- 1931.
- London :