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Bulletin No. XV, pp. 168-197
Bulletin No. XV, pp. 75-101
Bulletin No. XV, pp. 27-56
Bulletin No. XV, pp. 102-126
Bulletin No. XV, pp. 127-131
Bulletin
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- Bulletin (Philosophical Society of Washington)
Bulletin No. XV, pp. 57-74
Bulletin No. XV, pp. 132-167
Bulletin No. XV, pp. 1-26
Folder 7 1887 (May-December)