Mineral Statistics 1890-1893.
Report of H.M. Inspector of Mines for the North Staffordshire District for the Year 1889 p. 4. 1890 p. 3. 1891 p. 3.
Summaries of the Statistical Information given in the Reports of HM Inspectors of Mines for the Year 1889 p. 9. 1890 p. 9. 1891 p. 9. 1892 p. 11. 1893 p. 4.