Text ( visual ) : unmediated Molybdenum ores / by R. H. Rastall. -- London : John Murray , 1922. -- ix, 86 p. ; 22 cm. -- (Monographs on mineral resources with special reference to the British Empire). -- At head of title: Imperial Institute. -- (BA59022110) ; https://ci.nii.ac.jp/ncid/BA59022110 Author Heading(s): Rastall, R. H. (Robert Heron)