Microbe Hunters: Pocket Book Edition — Complete & Unabridged; Explorers in the Unseen World #49 By Paul de Kruif

From the book back: “Fourteen pioneers, men of indomitable courage, driven by a ceaseless urge to conquer the deadly enemies of mankind, explore the world of the microbe. Like lesser men they had their discouragements, their successes, and their failures, but with superhuman perseverance they surmounted all obstacles to reach their goals. So real are their problems and so human is their story that these scientists come to life in the pages of this book.”