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REFINE  Browse All : Paleontology--Colorado--Teller County and application/pdf and Naturalists--Colorado by Balfour, Bayley, author from Undated 1-2 of 2 Balfour, Bayley, author Letter from Isaac Bayle... Undated [letters (correspondenc...   Creator Balfour, Bayley, author Title Letter from Isaac Bayley Balfour to Theodore Cockerell Date Undated Format [letters (correspondence), application/pdf] Balfour, Bayley, author Letter from Isaac Bayle... Undated [letters (correspondenc...   Creator Balfour, Bayley, author Title Letter from Isaac Bayley Balfour to Theodore Cockerell Date Undated Format [letters (correspondence), application/pdf] 1-2 of 2

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