The mineral industry of the British empire and foreign countries. Statistics, 1920-1922. Coal, coke & by-products.

At head of title: Imperial mineral resources bureau.

The mineral industry of the British Empire and foreign countries. Statistics, 1920-1922. Petroleum and allied products.

At head of title: Imperial Mineral Resources Bureau.

The mineral industry of the British empire and foreign countries. Statistics, 1919-1921. Coal, coke and by-products.

At head of title: Imperial mineral resources bureau.

The mineral industry of the British Empire and foreign countries. Statistics, 1919-1921. Petroleum and allied products.

At head of title: Imperial mineral resources bureau.