https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12289967Edit ImageSaveSaveEditCropCustom TextPittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Unusually high roof in mine due to a poor ceiling. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1143 x 1200 px | 300 dpiLarge JPEG 3333 x 3500 px | 300 dpiBest Quality JPEG 4769 x 5008 px | 300 dpiTIFF 4769 x 5008 px | 300 dpi | 45.58 MBFree DownloadPittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Unusually high roof in mine due to a poor ceiling. Sourced from the Library of Congress.More