. Bulletin of the United States Geological Survey--The San Francisco Earthquake and Fire of April 18, 1906 and their effects on structures and structural materials . 11. COLLAPSE OF FLOOR PANEL, CAUSED BY LOAD FALLING FROM A FLOOR ABOVE, THIRDFLOOR OF /ETNA BUILDING, SAN FRANCISCO. The failure of the upper floor was due to the softening by heat of reenforcing steel bands. Photographsby Richard L.

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