Butterley Company correspondence file on the starting of part-time mining classes at Heanor Mining School Including memorandum on proposed scheme for part-time day instruction in mining, including suggested timetable and syllabuses, Jan 1938, minutes of meeting to discuss proposals for mining courses, Feb 1938, correspondence on subscription to student prize fund, July 1938-July 1939, and progress report on course, June 1939 Jan 1938-Nov 1939