https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12269205Edit ImageSaveSaveEditCropCustom TextBottom of concrete slab for new sanitary privy. This is a way of reducing the weight of slabs. The concrete beams are placed where needed. Minnesota. 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 1200 x 947 px | 300 dpiLarge JPEG 3500 x 2762 px | 300 dpiBest Quality JPEG 5000 x 3945 px | 300 dpiTIFF 5000 x 3945 px | 300 dpi | 18.81 MBFree DownloadBottom of concrete slab for new sanitary privy. This is a way of reducing the weight of slabs. The concrete beams are placed where needed. Minnesota. Sourced from the Library of Congress.More