1957 publication_date QS:P577,+1957-03-21T00:00:00Z/11 Authority file ISBN: 9780105199977 Source http://www.legislation.gov.uk/id/ukpga/Eliz2/5-6/11...
July 1957 publication_date QS:P577,+1957-07-31T00:00:00Z/11 Authority file ISBN: 9780105455943 Source http://www.legislation.gov.uk/id/ukpga/Eliz2/5-6/53...