U. S. GEOLOGICAL SURVEY BULLE 
A. BUCKLING OF BASEMENT COLUMN DUE TO FAILURE 
OF PLASTERED METAL-LATH FIREPROOFING, RIALTO 
BUILDING, SAN FRANCISCO. 
Photograph by Richard L. Humphrey. 
B. DAMAGE SAID TO HAVE BEEN CAUSED BY DYNAMITE, RIALTO BUILDING. 
Photograph by John Stephen Sewell. 
