. 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 . A. CRACKS IN MASONRY AND SETTLING OF OUTER TERRACE, POST-OFFICE BUILDING, SAN FRANCISCO. The surface of the street went down at this point at least 4 feet. Photograph by John Stephen ],. EFFECT OF EARTHQUAKE IN LOOSENING STONEWORK, NORTHEAST FACE OFPOST-OFFICE BUILDING. Photograph by Richard L. Humphrey. U. S. GEOLOGICAL SURVEY BULLETIN NO. 324 PL. XLV

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