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Bai Du Bai Ke
Brainy Quote
Census Bureau
CheckYourMath.com - unit conversions, math
Open Book Project
PDF Search Engine
QueryCAT for Frequently Asked Questions
Reference Answers
USPS Address Standardization — County, State, Local Highways
USPS Business Word Abbreviations
USPS Postal Addressing Standards
USPS Secondary Unit Designators
USPS Street Suffix Abbreviations
USPS Two–Letter State and Possession Abbreviations
Wikibooks - the open-content textbooks
Wikimedia - Medias
Wikipedia
Wikiquote - sourced quotations from notable people and creative works
Wikisource
Wikiversity - learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university
Wiktionary - Dictionary of more than 500 languages
Wolfram MathWorld -- The most extensive mathematics resource on web
ZIP Code Statistics