Colored Waterway Map of the Grand Canal (岳阳至长江入海及自江阴沿大运河至北京故宮水道彩色图), 1736 to 1861, from the Library of Congress - service-gdc-gdcwdl-wd-l -13-53-1-wdl 13531-wdl 13531.
Unknown author<span style="display: none;">Unknown author</span>
Library of Congress:  <a rel="nofollow" class="external free" href="https://lccn.loc.gov/2021668277">https://lccn.loc.gov/2021668277</a>