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“Performed by Settlers, irrigation can be done in Deserts, Grasslands, Hills, Plains and Rivers...Irrigation (Civ1)
“Improvements are built by Settlers, but can be pillaged by any land unit. Built by Settlers...Improvements (Civ1)
“Built by Settlers only. Press the Fortress key (F key) or choose the Fortress option from the...Fortress (Civ1)
“Mining increases the production value of Desert (+1), Hills (+3), and Mountain (+1) squares...Mine (Civ1)