Routledge studies in nineteenth-century philosophy ; Routledge studies in nineteenth-century philosophy Routledge studies in eighteenth-century philosophy Routledge studies in seventeenth-century philosophy ; Routledge studies in seventeenth-century philosophy. Routledge studies in seventeenth-century philosophy Routledge studies in eighteenth century philosophy. Routledge studies in twentieth-century philosophy Routledge studies in twentieth-century philosophy ; Routledge studies in twentieth century philosophy.