The Mineral Resources Division of the Imperial Institute arranged for the issue of this series of monographs on mineral resources in amplification and extension of those which have appeared in the Bulletin of the Imperial Institute. The object of the monographs is to give a general account of the occurrences and commercial utilization of the more important minerals, particularly in the British Empire. They do not cover mining or metallurgical processes. Only seven volumes were produced between 1952 (Vermiculite) and 1970 (Wollastonite).