(原始内容存档于2024-01-27). Stein, Alan. Seattle awards contract for construction of CedarRiver Pipeline Number Four on March 21, 1951.. HistoryLink. [2024-01-27]. (原始内容存档于2024-01-27)
nation's oldest. Cedar Rapids Gazette. 2009-11-24 [2009-11-25]. (原始内容存档于2012-12-08). Love, Orlan. Heavy use draining aquifer. Cedar Rapids Gazette. 2009-12-06