Heart of America Pr

year of publication	ISBN	author(s)	title
1976	978-0-913902-06-6	Roy Ehrhardt	Trade marks: Watch cases, pocket watches, precious stones, diamonds
1974	978-0-913902-08-0	Larry Ehrhardt · Roy Ehrhardt	Price Guide to 2000 Winchester and Marble's Hardware Collectibles
1985	978-0-913902-09-7	Ray Ehrhardt	American Pocket Watch Identification and Price Guide, Book 2
1976	978-0-913902-10-3	Roy Ehrhardt	Elgin 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
1979	978-0-913902-27-1	Roy Erhardt · Malvern Rabeneck	Clock Identification & Price Guide Book
''	978-0-913902-29-5	Roy Ehrhardt	American pocket watch 1979 price indicator: Identification and price guide
1971	978-0-913902-38-7		Everything You Wanted to Know but Didn't Know Who to Ask
1983	978-0-913902-49-3	Roy Ehrhardt	F. Kroeber Clock Co. Identification and Price Guide
''	978-0-913902-51-6	Sherry Ehrhardt · Peter Planes	Vintage American and European Wrist Watch Price Guide/Book 1
1987	978-0-913902-55-4	Sherry Ehrhardt · Peter, II Planes	1987 Price Guide for Vintage American and European Wrist Watch Price Guide
1988	978-0-913902-56-1	Sherry Ehrhardt · Roy Ehrhardt · Joe Demesy · Ken Specht · Peter Planes · David A. Mycko	Vintage American and European Wrist Watch Price Guide/Book 2
1989	978-0-913902-57-8	Sherry Ehrhardt · Roy Ehrhardt · Peter Planes · David A. Mycko	Vintage American and European Character Wristwatch Price Guide, Book 3
''	978-0-913902-58-5	Sherry Ehrhardt · Roy Ehrhardt · Joe Demesy · Peter Planes · David A. Mycko	Vintage American & European Wrist Watch Price Guide: Book 4
1991	978-0-913902-59-2	Sherry Ehrhardt · Roy Ehrhardt · Peter Planes · David A. Mycko	Vintage American and European Wrist Watch Price Guide/Book 5
1991	978-0-913902-60-8	Roy Ehrhardt · Joe Demesy	Patek Philippe: Wrist Watches, Pocket Watches, Clocks: Identification and Price Guide: Retail & Vintage Prices: Book 1
1992	978-0-913902-65-3	Ehrhardt	Swatch: Almost Everything You Need to Know About Dealing and Collecting Swatches
1993	978-0-913902-69-1	Roy Ehrhardt	Foreign Clock Price Guide
''	978-0-913902-71-4	''	Foreign Clock Identification and Price Guide: Book 5
''	978-0-913902-78-3	Roy Ehrhardt · William Meggers	American Pocket Watch: Serial Number Grade Book
''	978-0-913902-79-0	Roy Enrhardt	American Pocket Watch: Serial Number Grade Book
1995	978-0-913902-88-2	Roy Ehrhardt	Ehrhardt and Meggers Railroad Watches: Identification and Price Guide
1994	978-0-913902-89-9	Ehrhardts · Roy Ehrhardt	Bradley Character Watches Identification & Price Guide
1997	978-0-913902-98-1	Roy Ehrhardt	American Clock Book No. 4: Price Guide
''	978-0-913902-99-8	''	Patek Philippe Parts & Materials Catalog Book