| title | ISBN-13 | year of publica- tion | other author(s) |
|---|---|---|---|
| Frommer's Caribbean, 1990 | 978-0-13-332454-9 | 1989 | Darwin Porter · Danforth Prince |
| Frommer's Germany, 1990 | 978-0-13-218389-5 | 1989 | Darwin Porter · Danforth Prince |
| Frommer's Scandinavia on $60 a Day, 1989-90 | 978-0-13-791484-5 | 1989 | Darwin Porter · Danforth Prince |
| Frommer's Switzerland and Liechtenstein, 1990-1991 | 978-0-13-217324-7 | 1989 | Darwin Porter · Danforth Prince |