June 1916. Sandy Beach near Fall River, Massachusetts. "Two girls in foreground about 15. Mr. Tebbutt says dance hall bad conditions. Penny picture machine attracting crowds." View full size. Photograph by Lewis Wickes Hine.

September 1908. Young mule drivers and trapper boy at the Brown Mine near Brown, West Virginia. Underground from 7 a.m. to 5:30 p.m. View full size.

June 1942. Construction work at the Tennessee Valley Authority's Douglas Dam. View full size. 4x5 Kodachrome transparency by Alfred Palmer.

When Teacher's away, the boys will play. Posed mayhem from St. Louis photographer Fitz W. Guerin. View full size.

A well-rounded young lady in dancing costume as photographed in the studio of Fitz Guerin in 1902, the year before his death. View full size.

Chesapeake & Ohio M-1 steam turbine 502 at Cincinnati on July 2, 1949. These coal-fired turbine locomotives were complete failures in passenger service despite their impressive size and complexity. Built in 1947 by Baldwin Locomotive for exorbitant prices, all three were retired by 1950. Color of this engine, in case you're wondering, was yellow-orange up top with gray beneath, with dark blue lettering and trim. View full size.

January 1911. "Serafino driving Chub, his mule. Shaft #7, Pennsylvania Coal Company mine at South Pittston." Bright spots are open flames of lamps on the boys' hats. Photograph by Lewis Wickes Hine. View full size.