For a singular image of the Great Depression and the roughness of those years, it's hard to do much better than Dorothea Lange's 1936 photograph of Florence Owens Thompson, two of her children tucking their faces over her shoulders, a baby in her lap.

Where that image comes from, there are many, many more: around 175,000 surviving portraits of America between 1935 and 1945 taken by the photographers of the government's Farm Security Administration. The Library of Congress, which houses the collection, has, remarkably, digitized all the negatives and tagged the records with loads of data, such as who took the picture and where it was taken.

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