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- The Oretian Stage of the New Zealand Triassic System By J. D. Campbell, Canterbury University College., from Volume 82, 1954-55
- The Otapirian Stage of the Triassic System of New Zealand. Part II. By J. D. Campbell, from Volume 84, 1956-57
- The Otapirian Stage of the Triassic System of New Zealand Part I By J. D. Campbell, Canterbury University College, and I. C. McKellar, New Zealand Geological Survey., from Volume 83, 1955-56