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• Investigations during 1932 of combustibles in manholes in Boston, Mass.
• Investigations during 1935 of combustibles in manholes in Boston, Mass.
• Investigations during 1934 of combustibles in manholes in Boston, Mass.
• Investigations during 1936 of combustibles in manholes in Boston, Mass.
• Investigation during 1937 of combustibles in manholes in Boston, Mass.