(1968). Geohydrologic maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior.
Chicago-viite (17. p.)Geohydrologic Maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior, 1968.
MLA-viite (9. p.)Geohydrologic Maps of Fillmore County, Nebraska / [peta]. Washington, D C : Department of the Interior, 1968.
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