This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Robert Batty. Oporto The CustomHouse Quay Painted by Lieut Col Robert Batty Engraved by Robert Wallis blogspot html Robert Batty Robert Wallis PD Robert Batty Robert Wallis engraver Porto in the th century Cranes machines in art Treadwheel cranes PDold
Page 2023 Free-images.com. All images are Public Domain