"Glacial period." . . "North Dakota" . . "North Dakota." . . . . . . "The story of the prairies or the landscape geology of North Dakota" . . . . . . . . "The story of the prairies, or, The landscape geology of North Dakota" . "The story of the prairies, or, The landscape geology of North Dakota"@en . . "The story of the Prairies or the landscape geology of North Dakota" . . "The Story of the prairies or the landscape geology of north Dakota" . . . "Story of the prairies" . "The story of the prairies or, The landscape geology of North Dakota"@en . . . . . "The story of the prairies : or, the landscape geology of North Dakota" . . . . "The story of the prairies : or, The landscape geology on North Dakota"@en . "The story of the prairies; or, The landscape geology of North Dakota" . "The story of the prairies; or, The landscape geology of North Dakota"@en . . . . . . "The story of the prairies, or The landscape geology of North Dakota"@en . . . "The story of the prairies ; or, The landscape geology of North Dakota" . . . . . . . . . . "The story of the prairies" . "The story of the prairies"@en . "Landscape geology of North Dakota" . "Landscape geology of North Dakota"@en . . . . "The story of the prairies : or, The landscape geology of North Dakota"@en . "The story of the prairies : or, The landscape geology of North Dakota" . . . . . . . . "Geology." . . . . "Geology North Dakota." . . "Travel." . . "Glacial epoch." . .