TY - BOOK AU - Henderson,J.Vernon AU - Poole,William TI - Principles of economics SN - 0669144932 AV - HB171.5 .H423 1991 U1 - 330 20 PY - 1991/// CY - Lexington, Massachussetts PB - D.C. Heath and Company KW - Economics N1 - Includes bibliographical references and index ER -