VarietyPlus service is also available for coins already encapsulated by NGC.
For coins where the fee column is blank, no VarietyPlus charge is required to
have your coin designated during grading. For coins marked $15, a $15 surcharge
applies to the tier fee during grading, or a $15 fee applies to have the VarietyPlus
designation added to any coin already graded and encapsulated by NGC.
Bowers, Q. David. A Guide Book of Lincoln Cents. Whitman Publishing, Atlanta, 2008
Breen, Walter. Walter Breen’s Complete Encyclopedia of U.S. and Colonial Coins. Doubleday/FCI Press, New York, 1988
Daughtrey, Charles D. Looking Through Lincoln Cents: Chronology of a Series. author, Springfield, MO, 2004
Fivaz, Bill & J.T. Stanton. The Cherrypickers' Guide to Rare Die Varieties, 5th Edition, Volume 1. Whitman Publishing, Atlanta, 2009
Lange, David W. The Complete Guide to Lincoln Cents. Bowers & Merena Galleries, Wolfeboro, NH, 1996
Wexler, John & Kevin Flynn. The Authoritative Reference on Lincoln Cents. KCK Press, Rancocas, 1996
Wexler, John A. The Lincoln Cent Doubled Die. Published by the author, 1984
Wiles, James, Ph.D. The RPM Book Second Edition: Lincoln Cents. Stanton Publishing, Savannah, GA, 1997