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:
Silk AirForceAcademyEvent. en An undated photo of Leonard Silk second from left at Air Force Academy event cite web duke edu Leonard Silk Papers and undated bulk Rubenstein Library Duke University Photo credit Air Force Academy Unknown Air Force Academy photo PDUSGov Uploaded with Economists from the United States Journalists