Bronze Age Gold from Wales

Four reports contained within a card file. Report on gas cleaning plants for blast furnaces and efficiency of clean gas. Typed in black and purple ink inside a green card file. Report 1: report by Mr Brooke on gas cleaning at North Lincoln. Report 2: report by W.E. Simons on gas cleaning following a visit to Skinningrove Co.'s works. Dated 21/11/1919. Report 3: report on blast furnace gas cleaning. Dated 4/9/1917. report 4: report on gas cleaning: cleaning blast furnace gas for boilers and stoves by A. Lennox Leigh.