| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Town farms: New approaches in the use of active educational methods in the environment field | 978-92-871-O193-8 (92-871-O193-O) | 1982 |
H.W. · Harro Walk · Harry Welch · Harry Wels · Harry Wilk · Harry Willock · Harry Willshaw · Harry Wolk · Herri Waloejo