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The primary focus of the collectors was botanical, yet there are many images of people, landscapes and towns and cities of the period.

"freely accessible portal to historic botanical literature from the Missouri Botanical Garden Library."

Digital collection of images from tthe Curtis Botanical Magazine--one thousand forty-eight plates, plus pages of related text from the first 26 volumes.

This is a very interesting and unusual idea. Historians at Stanford have collected very specific and detailed information about historical events within short time frames and then produced graphic representations of these events that you can play over maps. It's very precise and perhaps too detailed for many high school level students to make sense of, however some of them helped show how historical phenomena occurred. Particularly chilling was the graphic showing slave purchases in the Rio slave market in the mid-C19th; you can see individual children being bought at specific times by specific people.