Crosskey, Lewes R creator Bombay Blackie And Son 1924 110:p Introduction (Page-1), Reference to Paragraphs In The Introduction (Page-13), Principle Facts (Page-13), Problems Worked (Page-14), The Measuring Points (Page-76), The Direct Method (Page-102). Lewes R Crosskey Elementary perspective 604.245,CRO 20230914113209.0