The J. Paul Getty Museum
Edward and Henry T. Anthony & Co.
License, verbatimCC0
The J. Paul Getty Museum: image dedicated to the public domain under Creative Commons Zero (CC0), stated on the media record itself ('Rights for Media'), with download clearance.
Edward and Henry T. Anthony & Co.. Redoubt Zabriskie on Cobb's Hill to Protect Signal Tower, showing the abattis., about 1862–1865. The J. Paul Getty Museum.