https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/4043111Edit ImageSaveSaveEditCropCustom TextRock Core Lab ShelvesThousands of boxes of rock core samples are stored like books on a shelf at the USGS Core Research Center.Photographer: Joshua Hicks, USGS. Original public domain image from FlickrMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseJPEGBanner JPEG 1200 x 795 px | 300 dpiLarge JPEG 2048 x 1356 px | 300 dpiFree DownloadRock Core Lab ShelvesThousands of boxes of rock core samples are stored like books on a shelf at the USGS Core Research Center.Photographer: Joshua Hicks, USGS. Original public domain image from FlickrMore