1917 Daily Telegraph war map of the British front (no. 24) , by Alexander Gross, from the Digital Commonwealth - commonwealth 4m90fn63r. (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:4m90fn63r">https://www.digitalcommonwealth.org/search/commonwealth:4m90fn63r</a>)
Alexander Gross
Digital Commonwealth