CalmView: Trosolwg

Rhif Cyf Amg	DARBAdd/53
Teitl	Letter from A.H. Leech, Engineer, to Harold Darbishire
Disgrifiad	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.
Dyddiad	31 March 1925
Fformat	Manuscript
Extent	1 item

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