HEATKEYS

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

Definition of word from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

Dictionary.com - the largest and most trusted free online dictionary. Instantly look up accurate and extensive definitions and word meanings, and hear audio pronunciations.

Free online English dictionary from Oxford, plus thesaurus, word of the day, resume examples, letter writing, and English grammar

The National Geophysical Data Center (NGDC) is part of the US Dept of Commerce, National Oceanic & Atmospheric Administration, National Environmental Satellite, Data, & Information Service

Encyclopedia of Earth Welcome to the Encyclopedia of Earth, an electronic reference about the Earth, its natural environments, and their interaction with society. The Encyclopedia is a free, fully sea ...

The largest and most trusted free online thesaurus. Quickly find accurate and up-to-date synonyms, antonyms, and related words at Thesaurus.com. Synonym dictionary, antonym dictionary, words synonyms.

The best online resource for topographic (topo) maps and high-resolution aerial photos covering all of the United States (U.S.) and Canada.

The Jet Propulsion Laboratory is the lead U.S. center for robotic exploration of the solar system, and conducts major programs in space-based Earth sciences and astronomy. JPL spacecraft have visited all of the planets from Mercury to Neptune.

Texts of the works of Sir Thomas Browne

This website is dedicated to Ostia, the harbour city of ancient Rome. Here you will find information, or links to information, for professional archaeologists and historians, and for students of Roman archaeology and history.