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Oughtred Clavis mathematicae .tif Book Oughtred William Clavis mathematicae excudebat Leon Lichfield veneunt apud Tho Robinson Oxoniae lat it Guilelmi Oughtred Clauis mathematicae denuo limata sive potius fabricata Cum aliis quibusdam ejusdem commentationibus quae in sequenti pagina recensentur Oxoniae excudebat Leon Lichfield