21. Portrait of Mr. Lisboa, village telegraph officer, with Fred L. Soper and Alexander Burke in Coronel Ponce, Mato Grosso, Brazil

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22. Fred L. Soper, Wilbur A. Sawyer, and their guide in front of a shelter at the site of a yellow fever infection near Coronel Ponce, Mato Grosso, Brazil

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23. Wilbur A. Sawyer crossing a bridge to inspect the site of a yellow fever infection near Coronel Ponce, Mato Grosso, Brazil

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24. Burity de Conceicao, Mato Grosso, Brazil

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25. Wilbur A. Sawyer's caravan and guides on the road to Coronel Ponce, Mato Grosso, Brazil

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26. Wilbur A. Sawyer and Fred L. Soper after the arrival of the airplane PP-CAO in Cuiaba, Mato Grosso, Brazil

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27. Group photo after Wilbur A. Sawyer's arrival in Cuiaba, Mato Grosso, Brazil

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28. PP-CAO, the "flying cow" airplane, in Corumba, Brazil

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29. Condor "Junker" plane in Sao Paulo, ready to fly to Corumba, Brazil

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30. Yellow Fever Laboratory, Bahia, Brazil

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31. Workers in the Yellow Fever Laboratory at Bahia, Brazil

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32. Fred L. Soper and Amaral Machado in the doorway of the Health Department building, Bahia, Brazil

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33. Nurses' House and Central Office of the Yellow Fever Service, Rio de Janeiro

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34. The Central Office of the Yellow Fever Service, Rio de Janeiro

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35. View of Rio de Janeiro from Wilbur A. Sawyer's room at the Gloria Hotel

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36. Wilbur A. Sawyer

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37. Merry Christmas from the House in the Pines from Margaret and Wilbur Sawyer

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38. Wilbur A. Sawyer and Thomas P. Hughes

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39. Yellow fever headquarters at Cuiaba, Mato Grosso, Brazil

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40. Wilbur A. Sawyer, his son Billy, and Johannes Bauer

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