Recommended Online Resources for the History of Photography
Heilbrunn Timeline of Art History, Metropolitan Museum of Art, New York
Includes many in-depth essays on photographic topics and hundreds of photographs. For essays, search for "photography." To browse photographs, go to Works of Art and select "Photographs" under "By Collection."
History of Photography in 40 Photographs, National Media Museum, England
A brief overview of photographic history, including famous images by major photographers.
History of Photography timeline, National Geographic Image Collection
Illustrated timeline with many photographic "firsts" (not all directly related to National Geographic).
Daguerreotype to Digital: A Brief History of the Photographic Process
Overview of photographic techniques, illustrated with historical photographs from Florida State collections.