This is a map created by Captain Theodor Seuss Geisel of the U.S. Army Special Service Division for all personal in the Army Orientation Course to show the areas in the world that suffer from high levels of malaria. It depicts intensity levels from light red to dark red. The map was created to educated U.S. servicemen on the areas of concern for this serious health concern. After high numbers of U.S. servicemen were put out of action in the South Pacific in 1942 due to malaria, an education campaign was created to better prepare U.S. military personnel on the dangerous of not taking personal precautions to combat malaria. Unfortunately to view this particular map in greater detail will require going to the link below:
https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~288913~90060542:This-is-Ann-----she-drinks-blood--H?sort=Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No&qvq=q:malaria;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=0&trs=4