... Abrasives; products of Canada; technology and application ...

In lower right corner of t.-p.: no. 673, 675, 677, 699, respectively.

The mineral industry of the British empire and foreign countries. Statistics, 1919-1921. Abrasives.

At head of title: Imperial Mineral Resources Bureau.

The mineral industry of the British empire and foreign countries. Abrasives.

At head of title: Imperial Institute.

The mineral industry of the British empire and foreign countries. Statistics, 1920-1922. Abrasives.

At head of title: Imperial Mineral Resources Bureau.