Places to buy vintage charms
A Charmed Existence  - Joan Munkacsi provided many of the fine examples for the book. You may find some on her website.
Ebay - It's obvious, but mentioned here for completeness
Ruby Lane - Alternative fixed price alternative to buying charms

Additional Charm Histories
Walter Lampl Biography - Cheri Van Hoover has written a fascinating account of Walter Lampl, one of the best makers of charms, especially enameled hearts.

Maker's Marks
Online Encyclopedia of Silver Marks, Hallmarks & Maker's Marks

Others Sites
Schiffer Books - Publisher of many collectible books, including ours!
Photo Express Palo Alto - Official photographer of the author.  ;-)
Family Genealogy