Exploratorium
Exploratorium: Panama Pacific International Exposition 3 D
View one hundred sets of stereographic images of the Panam-Pacific International Exposition. The site also explains how to make 3-D glasses that enable you to see the images in all their glory.
J. Paul Getty Trust
J. Paul Getty Museum: Explore Art, Photographs
A beautiful collection of photographs. Teachers and students can explore dozens of images done through a variety of photographic techniques. Clicking on the image will pull up a brief description of the work's history and content.
Central Pacific Railroad Photographic History Museum
Cpr Photographic History Museum Alfred Hart and the Illustrated Traveler's Map
This article written by Peter E. Palmquist describes the photographs taken by Albert A. Hart as he documented the building of the Central Pacific Railroad and then helped publicize it.