TY  - GEN
AU  - Watson David F
TI  - Contouring: a guide to the analysis and display of spatial data : (with programs on diskette) 
SN  - 0080402860
AV  - QA76.6 
PY  - 1992///
CY  - Oxford
PB  - Pergamon
KW  - Contours Cartography
KW  - Computer programs
N1  - Includes bibliographical references and index
ER  -