Silverman, H. A. The substance of economics : For the student and the general reader / by H. A. Silverman - 13th ed. - London : Sir Isaac Pitman and Sons, Ltd. , 1950. - 387 p. Hard Back Subjects--Topical Terms: EconomicsNature of economics Economic systemEvolution of economic system Dewey Class. No.: 330 / SIL-S