Watch List notes:

Bruce II, Colin R. and Thomas Michael, Geprge Cuhaj, Standard Catalog of World Gold Coins, Krause Publications, Iola, Wisconsin, USA, 2005, 5th edition, 1,215 pages, hardcover. This book goes into such specifics as fractional privately minted coins from US territories and siege coins and overall a great source of basic, and sometimes in depth, information on gold coins from 1601-2005.

Estimate: 20-40 USD