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In honour of R.T. Leiper on the occasion of his 80th birthday, 1961
- "In honour of R.T. Leiper on the occasion of his 80th birthday, 1961"@en
- "In honour of R.T. Leiper on the occasion of his 80th birthday, 1961"
- "In honour of R.T. Leiper on the occasion of his 80. birthday 1961"