Dictionaries:

A Dictionary of American English on Historical Principles (University of Chicago Press)

American Heritage Dictionary of the English Language (Houghton Mifflin Company)

Funk & Wagnalls New International Dictionary of the English Language (World Publishing)

The Oxford English Dictionary (Oxford University Press)

The Random House Dictionary of the English Language (Random House)

Webster's New International Dictionary of the English Language (Merriam Webster)

Webster's New World Dictionary (Prentice Hall)

Reference Books:

Yearbooks, Almanacs, Americana Annual (Grolier, Inc.)

The American Heritage Book of English Usage: A Practical and Authoritative Guide to Contemporary English

Britannica Book of the Year (Encyclopedia Britannica)

Famous First Facts (H.W. Wilson Company)

Washington Information Directory (Congressional Quarterly, Inc.)

Webster's Dictionary of Proper Names (Merriam Webster)

The World Almanac and Book of Facts (Newspaper Enterprise Association, Inc.)

Thomas' Register of American Manufacturers (Thomas Publishing Company)

Reference Books:

Yearbooks, Almanacs, Americana Annual (Grolier, Inc.)

The American Heritage Book of English Usage: A Practical and Authoritative Guide to Contemporary English

Britannica Book of the Year (Encyclopedia Britannica)

Famous First Facts (H.W. Wilson Company)

Washington Information Directory (Congressional Quarterly, Inc.)

Webster's Dictionary of Proper Names (Merriam Webster)

The World Almanac and Book of Facts (Newspaper Enterprise Association, Inc.)

Thomas' Register of American Manufacturers (Thoma