Cover of Pocket Books’ 1940 Edition of “Microbe Hunters"

Cover of Pocket Books’ 1940 edition of Paul de Kruif’s "Microbe Hunters" with an adjusted title, Dr. Ehrlich’s Magic Bullet and the Discoveries of 11 Other Microbe Hunters. Intended to promote a recent Warner Brothers film, the new cover and title angered de Kruif, who felt Warner Brothers improperly used his phrase “magic bullet” without crediting him. Future editions retained the original title