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Alt Ref No	DARBAdd/53
Title	Letter from A.H. Leech, Engineer, to Harold Darbishire
Description	Containing figures relating to the output in the bitumous mines of the U.S.A. and Britain. Output per person employed in the bitumous mines of the United States of America and Britain between the years 1913 and 1923.
Date	31 March 1925
Format	Manuscript
Extent	1 item

Record