Mining Qualifications Board : Examinations for certificates of competency (1st and 2nd class) (including limited certificates for stratified ironstone mines). Surveyors' certificates; mechanical and electrical engineers' certificates; mechanics' and electricians'  class I certificates.
Great Britain.Ministry of Power,issuing body.
Great Britain.Her Majesty's Stationery Office.
"May 15, 16 and 17, 1962".