| Titel | ISBN-13 (ISBN-10) | Erscheinungsjahr |
|---|---|---|
| Who is who in service to the earth: people, projects, organizations, key words ; over 8000 listings and cross indexes of people, projects, and organizations, dedicated to a sustainable future | 978-3-598-1116O-O (3-598-1116O-6) | 1900 |
H.J. · H. J. Keller · H. Keller · Hans-Joachim Keller · Hans-Jörg Keller · Hans Keller · J.K · J. Keller