Ayer Mill clock tower, Lawrence, Massachusetts. January 1941. View full size. 4x5 Kodachrome transparency by Jack Delano.

December 1942. Classification yard at the Chicago & Northwestern Proviso Yard, Chicago. View full size. 4x5 Kodachrome transparency by Jack Delano.

April 1943. Illinois Central R.R. freight cars at the South Water Street freight terminal, Chicago. The C & O and Nickel Plate Railroads lease part of this terminal. View full size. 4x5 Kodachrome transparency by Jack Delano.

Tenement homeworker with clothing tags. Roxbury, Massachusetts. August 1912. Photograph by Lewis Wickes Hine. View full size. Homeworkers, often children, sewed tags onto finished garments or performed other piecework at home instead of going to school.

October 1908. "Boy Sweeper and Carding Machines, Lincoln Cotton Mills, Evansville, Indiana." Photograph by Lewis Wickes Hine. View full size.

"Bring out yer rats." Ferrets were used in turn of the century New York to track down rodents. Here is the result of one such hunt in 1908. You want to be dressed in a jacket and tie for this kind of work. From the George Grantham Bain Collection. View full size.

December 1940. "Secondhand plumbing store, Brockton, Mass." 35mm Kodachrome transparency by Jack Delano. View full size. As of 2007, Saba Mechanical Plumbing & Heating is still in business in Brockton, at an address on Linus Avenue.