TY - BOOK AU - Henderson,J.Vernon AU - Poole,William TI - Principles of economics SN - 0669201731 AV - HB171.5 .H423 1991 U1 - 338.5 20 PY - 1991/// CY - Lexington, Mass. PB - D.C. Heath KW - Economics N1 - Includes bibliographical references and index ER -