TY  - BOOK
AU  - Clarke Keith C
TI  - Analytical and computer cartography
U1  - U11:(D6,9(B), N0 
PY  - 1990///
CY  - New Jersey 
PB  - Prentice Hall        
KW  - Geography
N1  - Bib chapterwise ,Appendix p. 260-283
ER  -