https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/7689958Edit ImageSaveSaveEditCropCustom Text[Map of the lower Potomac River showing picket lines, January 1862]View public domain image source hereMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGTIFFSmall JPEG 1200 x 903 px | 300 dpiLarge JPEG 2222 x 1672 px | 300 dpiTIFF 2222 x 1672 px | 300 dpi | 10.64 MBFree Download[Map of the lower Potomac River showing picket lines, January 1862]More