| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| A Billion Trips a Day: Tradition and Transition in European Travel Patterns | 978-O-7923-2297-9 (O-7923-2297-5) | 1993 | I. Salomon · J.P. Orfeuil |
H B · P. H. · P H L. Bovy · Piet H. Bovy · Piet H.L. Bovy