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[YELL203479-D1685] Letter from Thomas Ryan to John Pitcher introducing General de Lamothe and Professor Offret, dated September 8, 1906.
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[YELL203479-D1686] Letter from Thomas Ryan to John Pitcher introducting Ernest Stillman and Arthur Wood, dated September 1, 1906.
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[YELL203479-D1690] Letter from Thomas Ryan to John Pitcher introducing E. Stanley Gary, dated August 17, 1906.
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[YELL203479-D1691] Letter from Thomas Ryan to John Pitcher stating Mr. E. Stanley Gary desires to visit Yellowstone National Park, dated August 17, 1906.
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[YELL203479-D1693] Letter from Thomas Ryan to Secretary of Agriculture authorizing the collection of botanical specimens in the park, dated July 12, 1906.
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[YELL203479-D1785] Letter from Thomas Ryan to John Pitcher authorizing Frank L. Petersen to conduct camping parties in the park, dated September 12, 1906.
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[YELL203479-D1787] Letter from Thomas Ryan to John Pitcher authorizing J. H. Darrow to conduct camping parties in the park, dated September 1, 1906.
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[YELL203479-D1788] Letter from Thomas Ryan to John Pitcher authorizing L. C Shaw to conduct camping parties in the park, dated August 30, 1906.
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[YELL203479-D1789] Letter from Thomas Ryan to John Pitcher authorizing Howard Eaton to conduct camping parties in the park, dated August 23, 1906.
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[YELL203479-D1790] Letter from Thomas Ryan to John Pitcher authorizing S. K. Gulliford to conduct camping parties in the park, dated August 14, 1906.
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[YELL203479-D1791] Letter from Thomas Ryan to John Pitcher authorizing S. P. Parker to conduct camping parties in the park, dated August 10, 1906.
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[YELL203479-D1792] Letter from Thomas Ryan to John Pitcher authorizing C. E. Workman to conduct camping parties in the park, dated August 8, 1906.
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[YELL203479-D1793] Letter from Thomas Ryan to John Pitcher authorizing N. W. Frost to conduct camping parties in the park, dated August 7, 1906.
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[YELL203479-D1794] Letter from Thomas Ryan to John Pitcher authorizing Henry Dahlam to conduct camping parties in the park, dated August 4, 1906.
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[YELL203479-D1795] Letter from Thomas Ryan to John Pitcher authorizing W. H. Jordan to conduct camping parties in the park, dated August 4, 1906.
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[YELL203479-D1796] Letter from Thomas Ryan to John Pitcher authorizing S. W. Aldrich to conduct camping parties in the park, dated August 1, 1906.
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[YELL203479-D1798] Letter from Thomas Ryan to John Pitcher authorizing Aron Holm and F. H. Welch to conduct camping parties in the park, dated July 28, 1906.
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[YELL203479-D1799] Letter from Thomas Ryan to John Pitcher authorizing A. Lycan and Carl Miles to conduct camping parties in the park, dated July 25, 1906.
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[YELL203479-D1800] Letter from Thomas Ryan to John Pitcher authorizing Henry Dahlam to conduct camping parties in the park, dated July 25, 1906.
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[YELL203479-D1801] Letter from Thomas Ryan to John Pitcher authorizing Arthur and Walter Braten to conduct camping parties in the park, dated July 19, 1906.
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[YELL203479-D1802] Letter from Thomas Ryan to John Pitcher authorizing C. H. Brumfield to conduct camping parties in the park, dated July 17, 1906.
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[YELL203479-D1803] Letter from Thomas Ryan to John Pitcher authorizing L. C. Shaw to conduct camping parties in the park, dated July 13, 1906.
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[YELL203479-D1804] Letter from Thomas Ryan to John Pitcher authorizing James L. McLaughlin to conduct camping parties in the park, dated July 12, 1906.
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[YELL203479-D1805] Letter from Thomas Ryan to John Pitcher authorizing W. O. Dockstader to conduct camping parties in the park, dated July 10, 1906.
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[YELL203479-D1806] Letter from Thomas Ryan to John Pitcher authorizing H. E. Dennis to conduct camping parties in the park, dated July 10, 1906.
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[YELL203479-D1807] Letter from Thomas Ryan to John Pitcher authorizing T. E. Newcomb to conduct camping parties in the park, dated July 9, 1906.
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[YELL203479-D1808] Letter from Thomas Ryan to John Pitcher authorizing C. H. Brumfield to conduct camping parties in the park dated July 6, 1906.
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[YELL203479-D1809] Letter from Thomas Ryan to John Pitcher authorizing A. L. and Oscar Roseborough to conduct camping parties in the park, dated July 6, 1906.
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[YELL203479-D1810] Letter from Thomas Ryan to John Pitcher authorizing Henry Kitchens to conduct camping parties in the park, dated July 3, 1906.
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[YELL203479-D1811] Letter from Thomas Ryan to John Pitcher authorizing H. T. Fort to conduct camping parties in the park, dated July 3, 1906.
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[YELL203479-D1825] Letter from Thomas Ryan to John Pitcher forwarding 100 copies of a map of the park,  dated July 24, 1906.
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[YELL203479-D1841] Telegram from Thomas Ryan to John Pitcher regarding the construction of a fish hatchery in West Thumb, dated August 2, 1906.
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