U. S. GEOLOGICAL SURVEY 
BULLETIN NO. 324 PL. L 
A. COLLAPSE OF BUILDING DUE TO BUCKLING OF COLUMNS, SPRING VALLEY WATER 
COMPANY'S BUILDING, SAN FRANCISCO. 
Photograph by Richard L. Humphrey. 
B. FAILURE OF TERRA-COTTA TILE COVERING IN FIRE. UNION TRUST COMPANY'S 
BUILDING, SAN FRANCISCO. 
Photograph by Richard L. Humphrey. 
