Correction: Charles E. Anthon, Eli K. Price
Dave Hirt of Frederick, MD writes:

To read the earlier E-Sylum article, see:
VOCABULARY TERM: SERIES (http://www.coinbooks.org/v21/esylum_v21n14a14.html)

On Collector Marshall Lefferts
Dave Hirt writes:

To read the earlier E-Sylum article, see:
MARSHALL CLIFFORD LEFFERTS (1848-1928) (http://www.coinbooks.org/v21/esylum_v21n14a15.html)

On the Metal Formerly Known As Columbium
John Phipps of Atlanta, GA writes:

To read the earlier E-Sylum article, see:
NIOBIUM COIN CASE STUDY (http://www.coinbooks.org/v21/esylum_v21n14a30.html)

More on the "Janus Head" Copper
Bill Eckberg of Florida writes:

To read the earlier E-Sylum articles, see:
THE 1776 JANUS COPPER (http://www.coinbooks.org/v21/esylum_v21n14a12.html)
CONTINENTAL DOLLARS REVISITED (http://www.coinbooks.org/v21/esylum_v21n14a13.html)
1776 BRITISH ARTICLE ON MASSACHUSETTS STATE COINAGE (http://www.coinbooks.org/v21/esylum_v21n03a14.html)

On Golf Ball Markers and Guitar Picks

David Powell of North West London writes:

Ken Berger of San Diego writes:

To read the earlier E-Sylum articles, see:
2003 LIBERTY PLATINUM GUITAR PICK (http://www.coinbooks.org/esylum_v17n49a40.html)
THE NUMISMATICS OF GOLF (http://www.coinbooks.org/v21/esylum_v21n14a27.html)

UFO Coin Shot Down
Dr. Kavan Ratnatunga of Sri Lanka writes:

For a skeptic's take on the event, see:
Stefan Michalak's Story: No Aliens Required. (http://www.theironskeptic.com/articles/michalak/michalak.htm)

To read the earlier E-Sylum article, see:
ROYAL CANADIAN MINT ISSUES UFO ENCOUNTER COIN (http://www.coinbooks.org/v21/esylum_v21n14a31.html)