This is the first book of Debra L. Birge of which the first edition dates from the year 2000. Eight years later a second edition was published with some additions and adjustments. In this book all the U.S. ponies are mostly presented per family, and not individually; there's as good as no reference to the year in which they were brought into the market. There's also a number of pony merchandise, going from blankets, trays and bread boxes to ironing boards, roller skates and wall decorations!
The values are outdated and therefore not a reference anymore to the current market value.