This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
GreeneVardimanBlack. Greene Vardiman Black cropped from File from the Center for Disease Control and Prevention's Public Health Image Library PHIL Picture labelled as In Dr Black Lt visited Dr McKay Rt in Colorado Springs to investigate the Colorado brown stain phenomenon Dr McKay Dr Greene Vardiman Black image McKayandBlackCDC