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[47-05] Yellowstone Nature Notes. Vol. XXI No. 5. September - October 1947.
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[47-06] Yellowstone Nature Notes. Vol. XXI No. 6. November - December 1947.
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[47-i] General Index to Yellowstone Nature Notes Volume XXI [1947]
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[48-01] Yellowstone Nature Notes. Vol. XXII No. 1. January - February 1948.
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[48-02] Yellowstone Nature Notes. Vol XXII No. 2. March - April 1948.
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[48-06] Yellowstone Nature Notes. Vol. XXII No. 6. November-December 1948.
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[48-i] General Index to Yellowstone Nature Notes Volume XXII
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[49-01] Yellowstone Nature Notes. Vol. XXIII No. 1. January-February 1949.
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[49-02] Yellowstone Nature Notes. Vol. XXIII No. 2. March-April 1949.
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[49-i] General Index to Yellowstone Nature Notes Volume XXIII [1949]
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[50-01] Yellowstone Nature Notes. Volume XXIV No. 1. January - February [1950].
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[50-02] Yellowstone Nature Notes. Vol. XXIV. No. 2. March - April 1950.

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