<https://www.historynet.com/shermans-secret-weapon-was-his-map-maven/acwp-191100-merrill-01/>
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<https://www.historynet.com/shermans-secret-weapon-was-his-map-maven/acwp-191100-merrill-01/>
<https://www.historynet.com/shermans-secret-weapon-was-his-map-maven/acwp-191100-merrill-01/>