"A geological essay on the imperfect evidence in support of a theory of the Earth, deducible either from its general structure or from the changes produced on its surface by the operation of existing causes"@en . . . "A geological essay on the imperfect evidence in support of a theory of the earth, deducible either from its general structure or from the changes produced on its surface by the operation of existing causes"@en . . . . . . "A geological essay on the imperfect evidence in support of a theory of the earth deducible either from its general structure or from the changes produced on its surface by the operation of existing causes"@en . . . . . . . . "Geology." . . "Earth (Planet)" . . . . "Earth (Planet)" . .