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Consumption of explosives in May, 1931.
Consumption of explosives in June, 1931
Consumption of explosives in April, 1931
Consumption of explosives in December, 1930
Consumption of explosives in November, 1930 /W.W. Adams and L.S. Gerry.
Consumption of explosives in February, 1931
Consumption of explosives in March, 1931
Active list of permissible explosives and blasting devices approved prior to June 30, 1938