UNION SQUARE,HOTEL ST FRANCIS,1906 SAN FRANCISCO EARTHQUAKE,SKYSCRAPER,HOTEL,BUILDING,HUMAN,EARTHQUAKE,DISASTER,NATURAL DISASTER,SQUARE,STREET,UNION SQUARE,STOCKTON STREET,POST STREET,SAN FRANCISCO,CALIFORNIA,USA,NORTH AMERICA,WALKING,HISTORY,EARTH SCIENCE,SEISMOLOGY,ADULT,MAN,MALE,US,AMERICAN,MONOCHROME,BLACK-AND-WHITE,LANDSCAPE,APRIL,1906,20TH CENTURY,1900S,NORTH AMERICAN,UNITED STATES,HORIZONTAL,DAMAGE,DAMAGED,SEISMIC,SEISMOLOGICAL,HISTORICAL,RUINED,RUINS,DESTRUCTION,DESTROYED,URBAN,STEINBRUGGE COLLECTION,KARL V. STEINBRUGGE,AFTER,AFTERMATH,PEOPLE,MEN,BEAR PHOTO COLLECTION,BUILDINGS,DEBRIS,BRICKS,DOWNTOWN,SAN ANDREAS FAULT,LARGE,100TH ANNIVERSARY 1906-2006,AFTERMATH DESTRUCTION DISASTER,DAMAGE NATURAL RUINS,"