R.K. · R. R. · Ralph Krüger
| title | ISBN-13 | year of publica- tion |
|---|---|---|
| Canada, a New Geography | 978-0-03-925224-3 | 1974 |
| Canada;: A new geography | 978-0-03-925220-5 | 1970 |
| Regional and resource planning in Canada | 978-0-03-925239-7 | 1970 |
| Urban problems | 978-0-03-925246-5 | 1975 |