https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8802958Edit ImageSaveSaveEditCropCustom TextExpansion Of Blue Plains Sewage Treatment Plant: Additional Aeration Tanks Are Being Placed In Cleared Area In Foreground, April 1973. Photographer: Swanson, Dick. Original public domain image from FlickrMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGBanner JPEG 1200 x 805 px | 300 dpiLarge JPEG 3000 x 2012 px | 300 dpiFree DownloadExpansion Of Blue Plains Sewage Treatment Plant: Additional Aeration Tanks Are Being Placed In Cleared Area In Foreground, April 1973. Photographer: Swanson, Dick. Original public domain image from FlickrMore