Popular Science magazine has partnered with Google to make available it’s entire archive. Keyword searches bring up an entire month/issue with your search result highlighted. It looks they have OCR’d every page, making for some cool search results. (via)
For example, a search of “map” brought up this map of US science sites from 1967:
and this first air-map of the north pole from 1931:
“Chart” brings up radiological diagrams from 1950 (among many many others)
An addictive collection of beautiful charts, graphs, maps, and interactive data visualization toys -- on topics from around the world.