After David Garrard Lowe's Lost Chicago was published in 1975, people he'd never met began giving him photographs of long-gone buildings. Architect Bertrand Goldberg, whom Lowe had met when they appeared together on a talk show, "wrote me a letter and sent me a picture of a gas station and said, 'This is something you should have had in your book,'" says Lowe, who grew up in Chicago and returns several times a year. Goldberg's gas station was a whimsical structure that occupied the northeast corner of LaSalle and Maple from 1940 to 1965. Lowe agreed and put it in a rewritten version of the book that came out last year. The update also includes a treasure trove of images from the 1933 World's Fair and many buildings--such as the Chicago Stadium, 900 N. Michigan, and the Arts Club--that have come down since the first edition. "Chicago throws things away," says Lowe, "whether it's the stockyards or railroads that are the heart of it. When you lose something slightly different and replace it with something like North Bridge, which could be anywhere, you really give away your urban capital." "Lost Chicago: A Vanished Metropolis"--an exhibit of 100 photographs from the book--runs through January 10 at the Graham Foundation, 4 W. Burton. Hours are Monday through Thursday from 10 to 4, and admission to the gallery is free. For more information, call 312-787-4071.