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Amgueddfa Cymru – Museum Wales
Printed in black ink on white paper. Full Title: 'The Trend of Development in Steam Production for Large Power Stations' by Dr. Friedrick Munzinger. Reprinted from the Journal of the Institute of Fuel October, 1930. Loose within a green card file labelled 'Colliery Boiler Plant B31', 'Cefn Coed Data' and 'Colliery Engineering'.
