. 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, PAVILION OF POST-OFFICE, SANFRANCISCO. he window reveal and sill were jostled together by the earthquake at thepoint indicated by the arrow. Photograph by John Stephen B. EFFECT OF SLIP, MISSION STREET, SAN of post-office building at the left. Photograph submitted by Richard L. Humphrey. U. S. GEOLOGICAL. SURVEY ETIN NO. 324 PL. XLIV

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