Manual for the Fielden Manograph type EF1, with circuit diagrams and notes. Fielden (Electronics) Limited, Wythenshawe, Manchester, 1951. Manual for the Fielden Manograph Type EF1 1951
Booklet relating to the Fielden Air Pollution Management System. Three copies. Fielden (Electronics) Limited, Manchester, c1955 Air pollution management system booklet circa 1950-1959