These reports provide a review of significant changes that occurred during the twentieth century in industries requiring use of metals and industrial minerals. It includes a timeline and a summary that discusses major...
This tutorial traces the history of the telescope, beginning with Galileo's first small refractor, to the era of orbiting space telescopes. Topics include Galileo's trouble with the church over the observations he made...
This is a world-wide database of the longest and deepest caves. The data is sorted by depth (deeper than 300 m) and by length (longer than 3 km). There is also an alphabetic list by country, and bibliographic or contact...
Manage your resources
Save, organize, and share resources that you find.
Subscribe to bulletins
Automatically be notified about new resources that match your interests.
It's easy, fast, and FREE!