https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8799786Edit ImageSaveSaveEditCropCustom Text"Caterpillars" work in dust and soot hauling logs to landing area where they will be loaded onto trucks. Face mask filters ash and soot-filled air so driver can breathe, September 1973. Photographer: O'Rear, Charles. Original public domain image from FlickrMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGBanner JPEG 1200 x 808 px | 300 dpiLarge JPEG 3000 x 2019 px | 300 dpiFree Download"Caterpillars" work in dust and soot hauling logs to landing area where they will be loaded onto trucks. Face mask filters ash and soot-filled air so driver can breathe, September 1973. Photographer: O'Rear, Charles. Original public domain image from FlickrMore