The American Heritage® Dictionary, Fourth Edition
Over 200,000 entries feature 10,000 new words and senses, 70,000 audio word pronunciations, 900 full-page color illustrations, language notes and word-root appendixes.

The American Heritage® Spanish Dictionary, Second Edition
This free online Spanish-English translation dictionary is newly revised to include the most current computer, telecommunications, and Internet vocabulary and to include pronunciations in both English and Spanish. Featuring American English and Latin American Spanish, it contains 70,000 entries with more than 120,000 meanings.

The Britannica Concise
Britannica Concise is a complete, 28,000 article, single-volume encyclopedia from the editors of Encyclopædia Britannica. Visit Encyclopædia Britannica Online to access the complete Encyclopædia Britannica, the Britannica Student Encyclopedia, a world atlas, interactive timelines, Merriam-Webster's Collegiate Dictionary and Thesaurus, hundreds of magazine titles, daily features and much more.

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.

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Weights and Measures
Trying to find out how many gallons is equal to 50 liters? This conversion calculator can help you convert measurements for area, length, weight, and volume whether you're using the metric system, the U.S. system, or both.