H.G. · Helen Gregor · Helen Gregory · Helene Großwart
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Collector's Guide to Toasters & Accessories: Identification & Values | 978-0-89145-774-9 (0-89145-774-7) | 1997 |
| The Collectors Encyclopedia of Granite Ware: Colors, Shapes & Values, Book 2 | 978-0-89145-534-9 (0-89145-534-5) | 1993 |
| The Collector's Encyclopedia of Granite Ware: Colors, Shapes and Values | 978-0-89145-412-0 (0-89145-412-8) | 1990 |