41. Fred L. Soper

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42. [Yellow Fever Service public information posters as they appeared in streetcars in Recife, Brazil] (image 1)

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43. [Yellow Fever Service public information posters as they appeared in streetcars in Recife, Brazil] (image 2)

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44. [Yellow Fever Service public information posters as they appeared in streetcars in Recife, Brazil] (image 3)

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45. [Counting hookworms in prisoners in Asuncion, Paraguay] (image 1)

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46. [A type of privy put in as a result of the campaign against hookworm in Paraguay] (image 3)

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47. [A type of privy put in as a result of the campaign against hookworm in Paraguay] (image 4)

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48. [Counting hookworms in prisoners in Asuncion, Paraguay] (image 2)

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49. [A type of privy put in as a result of the campaign against hookworm in Paraguay] (image 1)

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50. [A type of privy put in as a result of the campaign against hookworm in Paraguay] (image 2)

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51. 'Ubiqueteers' J.H.U. School of Hygiene and Public Health

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52. Fred L. Soper's United States passport

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53. A nine year-old Brazilian boy, displaying the hookworms and tapeworms he expelled when treated by the Rockefeller Foundation staff

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54. Soper preparing for an inspection tour of Maranhao, Brazil

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55. Fred Soper and his Alpha Kappa Kappa fraternity brothers at Rush Medical College

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56. Diagram of female hookworms used in public education lectures

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57. Jaguaribe river during rainy season in Ceara, Brazil

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58. Diagram of male hookworms used in public education lectures

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