Columbia subject headings:
Mississippi National River and Recreation Area (Minn.)--Management.
Recreation areas--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.
Rivers--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.
Harvard subject headings:
Mississippi National River and Recreation Area (Minn.)--Management.
Recreation areas--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.
Rivers--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.
Princeton subject headings:
Mississippi National River and Recreation Area (Minn.)--Management.
Recreation areas--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.
Rivers--Environmental aspects--Minnesota--Mississippi National River and Recreation Area.