https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8765486Edit ImageSaveSaveEditCropCustom TextTony Murphy Has His Lung Capacity Tested While Walking on a Treadmill at the Black Lung Laboratory at the Appalachian Regional Hospital in Beckley, West Virginia 06/1974. Photographer: Corn, Jack. Original public domain image from FlickrMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGSmall JPEG 815 x 1200 px | 300 dpiLarge JPEG 2037 x 3000 px | 300 dpiFree DownloadTony Murphy Has His Lung Capacity Tested While Walking on a Treadmill at the Black Lung Laboratory at the Appalachian Regional Hospital in Beckley, West Virginia 06/1974. Photographer: Corn, Jack. Original public domain image from FlickrMore