(1968). Geohydrologic maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior.
Chicago Style (17. basım) AtıfGeohydrologic Maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior, 1968.
MLA (9th ed.) AtıfGeohydrologic Maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior, 1968.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..