Heart of America Pr

year of pub­li­ca­ti­onISBNauthor(s)title
1976978-0-913902-06-6Roy EhrhardtTrade marks: Watch cases, pocket watches, precious stones, diamonds
1974978-0-913902-08-0Larry Ehrhardt · Roy EhrhardtPrice Guide to 2000 Winchester and Marble's Hardware Collectibles
1985978-0-913902-09-7Ray EhrhardtAmerican Pocket Watch Identification and Price Guide, Book 2
1976978-0-913902-10-3Roy EhrhardtElgin Watch Company Grade and Serial Numbers
  ''978-0-913902-17-2   ''Waltham Pocket Watch Identification and Price Guide Using Serial Numbers and Pictures of Waltham Watch Movements
1979978-0-913902-27-1Roy Erhardt · Malvern RabeneckClock Identification & Price Guide Book
  ''978-0-913902-29-5Roy EhrhardtAmerican pocket watch 1979 price indicator: Identification and price guide
1971978-0-913902-38-7Everything You Wanted to Know but Didn't Know Who to Ask
1983978-0-913902-49-3Roy EhrhardtF. Kroeber Clock Co. Identification and Price Guide
  ''978-0-913902-51-6Sherry Ehrhardt · Peter PlanesVintage American and European Wrist Watch Price Guide/Book 1
1987978-0-913902-55-4Sherry Ehrhardt · Peter, II Planes1987 Price Guide for Vintage American and European Wrist Watch Price Guide
1988978-0-913902-56-1Sherry Ehrhardt · Roy Ehrhardt · Joe Demesy · Ken Specht · Peter Planes · David A. MyckoVintage American and European Wrist Watch Price Guide/Book 2
1989978-0-913902-57-8Sherry Ehrhardt · Roy Ehrhardt · Peter Planes · David A. MyckoVintage American and European Character Wristwatch Price Guide, Book 3
  ''978-0-913902-58-5Sherry Ehrhardt · Roy Ehrhardt · Joe Demesy · Peter Planes · David A. MyckoVintage American & European Wrist Watch Price Guide: Book 4
1991978-0-913902-59-2Sherry Ehrhardt · Roy Ehrhardt · Peter Planes · David A. MyckoVintage American and European Wrist Watch Price Guide/Book 5
1991978-0-913902-60-8Roy Ehrhardt · Joe DemesyPatek Philippe: Wrist Watches, Pocket Watches, Clocks: Identification and Price Guide: Retail & Vintage Prices: Book 1
1992978-0-913902-65-3EhrhardtSwatch: Almost Everything You Need to Know About Dealing and Collecting Swatches
1993978-0-913902-69-1Roy EhrhardtForeign Clock Price Guide
  ''978-0-913902-78-3Roy Ehrhardt · William MeggersAmerican Pocket Watch: Serial Number Grade Book
  ''978-0-913902-79-0Roy EnrhardtAmerican Pocket Watch: Serial Number Grade Book
1995978-0-913902-88-2Roy EhrhardtEhrhardt and Meggers Railroad Watches: Identification and Price Guide
1994978-0-913902-89-9Ehrhardts · Roy EhrhardtBradley Character Watches Identification & Price Guide
1997978-0-913902-98-1Roy EhrhardtAmerican Clock Book No. 4: Price Guide
  ''978-0-913902-99-8   ''Patek Philippe Parts & Materials Catalog Book