| title | ISBN-13 | year of publication |
|---|---|---|
| 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 |
R.K. · R. Krüger · R.R. · R.R. Krueger · R. Ray · Ralph Krüger · Ralph Ray