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Investigations during 1932 of combustibles in manholes in Boston, Mass.

Investigations during 1934 of combustibles in manholes in Boston, Mass.

Ventilation of manholes.

Investigations during 1935 of combustibles in manholes in Boston, Mass.

Ventilation of manholes.

Investigations during 1936 of combustibles in manholes in Boston, Mass.

Investigation during 1937 of combustibles in manholes in Boston, Mass.


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