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[49-01] Yellowstone Nature Notes. Vol. XXIII No. 1. January-February 1949.
Estey, Harold J., [49-01] Yellowstone Nature Notes. Vol. XXIII No. 1. January-February 1949. (1949). Montana History Portal, accessed 16/02/2025, https://www.mtmemory.org/nodes/view/115063