مصادر الصور
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(2-1) Nebraska State Historical Society RG3198–126.
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(3-1) Library of Congress LC-USZ62–113665.
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(3-2) Library of Congress LC-H25–16945-F.
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(3-3) Library of Congress LC-H261–4783.
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(3-4) Wisconsin Historical Society WHi-65140.
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(3-5) Library of Congress LC-B2–2464–10.
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(3-6) Oregon Historical Society ba18217.
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(4-1) Library of Congress LC-B2–1369–16.
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(4-2) Library of Congress LC-H261–1734.
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(4-3) Library of Congress LC-USZ62–118488.
