Documentary photography usually refers to a popular form of photography used to chronicle events or environments both significant and relevant to history and historical events as well as everyday life. It is typically undertaken as professional photojournalism, or real life reportage, but it may also be an amateur, artistic, or academic pursuit. History The term document applied to photography antedates the mode or genre itself. Photographs meant to accurately describe otherwise unknown, hidden, forbidden, or difficult-to-access places or circumstances date to the earliest daguerreotype and calotype "surveys" of the ruins of the Near East, Egypt, and the American wilderness areas. Nineteenth-century archaeologist John Beasly Greene, with his photographic assistant Samuel Swatman, traveled to Nubia in the early 1850s to photograph the major ruins of the region; One early documentation project was the French Missions Heliographiques organized by the official Commission des Monuments historiques to develop an archive of France's rapidly disappearing architectural and human heritage; the project included such photographic luminaries as Henri Le Secq, Edouard Denis Baldus, and Gustave Le Gray. In the United States, photographs tracing the progress of the American Civil War (1861-1865) by photographers for at least three consortia of photographic publisher-distributors, most notably Mathew Brady and Alexander Gardner, resulted in a major archive of photographs ranging from dry records of battle sites to harrowing images of the dead by Timothy O'Sullivan and evocative images by George N. Barnard. A huge body of photography of the vast regions of the Great West was produced by official government photographers for the Geological and Geographical Survey of the Territories (a predecessor of the USGS), during the period 1868–1878, including most notably the photographers Timothy O'Sullivan and William Henry Jackson. Both the Civil War and USGS photographic works point up an important feature of documentary photography: the production of an archive of historical significance, and the distribution to a wide audience through publication. The US Government published Survey photographs in the annual Reports, as well as portfolios designed to encourage continued funding of scientific surveys. The development of new reproduction methods for photography provided impetus for the next era of documentary photography, in the late 1880s and 1890s, and reaching into the early decades of the 20th century. This period decisively shifted documentary from antiquarian and landscape subjects to that of the city and its crises. The refining of photogravure methods, and then the introduction of halftone reproduction around