TY - BOOK AU - Heywood,Ian AU - Cornelius,Sarah AU - Carver,Steve TI - An introduction to geographical information systems SN - 0131293176 AV - G70.212 .H49 2006 U1 - 910.285 22 PY - 2006/// CY - New York PB - Pearson Prentice Hall KW - Geographic information systems KW - information systems N1 - Includes bibliographical references and index ER -