A Dictionary of Units of Measurement The dictionary includes all the units of the International System of Units (SI); many other units of the metric system; various non-metric units such as astronomical, electronvolt and parsec and all the units of the English traditional systems.
Common Weights and Measures Produced by the University of California, College of Chemistry. Includes mathematical notation for orders of magnitude, and metric prefixes and common U.S. and metric equivalents.
Roget's II: The New Thesaurus "Containing 35,000 synonyms and over 250,000 cross-references in an easy-to-use format, this thesaurus features succinct word definitions and an innovative hyperlinked category index."
Wikipedia A multilingual encyclopedia written collaboratively by anyone with access to the Internet
Library of Congress Country Studies "The Country Studies Series presents a description and analysis of the historical setting andthe social, economic, political, and national security systems and institutions of countries throughout the world."
Portals to the World Another Library of Congress site which provides selective links providing authoritative, in-depth information about the nations and other areas of the world. They are arranged by country or area.
World Factbook Produced by the Central Intelligence Agency and updated throughout the year.
Time Service Department Department of the Navy "The Official Source of Time for the Department of Defense (DoD) and for theGlobal positioning System (GPS), and a Standard of Time for the United States. "