. 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 . B. FAILURE OF TERRA-COTTA COLUMN COVERINGS, RESULTING IN BUCKLED COLUMNS;ENDURANCE OF CINDER-CONCRETE FLOORS; CENTER OF GROUND FLOOR, ARONSONBUILDING, SAN FRANCISCO. Photograph by Richard L. Humphrey. U. S. GEOLOGICAL SURVEY EULLETIN NO. 324 Fl. i II \ ! I

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