the photographic record of the past is uneven, given to emphasizing certain plaisance, things, events at the expense of others, selected moments that flash up from the continuum of time. unlike writers or painters, photographers, in the era before computers, had to be in close proximity to their subject, such an observation seems obvious, but consequences are far-reaching. we usually unthinkingly visualize the civil war to the appearance of union activities and northern sites, rather than southern ones, giving little thought to the naval blockade of southern ports that made it difficult for seven photographers to make a visual record. similar sorts of visual inequities exist in the documentation of western american history. the gold rush california, attracting photographers who created a visual record in the 1850's that was far more extensive than contemporary records existing for arizona or new mexico, nebraska, or kansas. despite photography's affordability, 19th-century studio photographs favor certain social classes over others, leaving us with relatively few pictures of the urban