This 2003 study used aerial photos taken between 1939 and 1997 to quantify vegetation change in the landscape mosaic of grasslands, shrublands, woodlands and forests of the San Francisco Bay Area.
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Russell, W.H. and J.R. McBride. 2003. Landscape scale vegetation-type conversion and fire hazard in the San Francisco bay area open spaces. Landscape and Urban Planning 64:201-208.