TY  - BOOK
ED  - ACSM - ASPRS Annual Convention
TI  - Technical papers. Vol.4
SN  - 0-944426-42-5
AV  - GY TA502.A47 Vol.4 
PY  - 1991///
CY  - Bethesda : 
PB  - American Congress on Surveying and Mapping
KW  - Geographical information systems
KW  - Congresses
KW  - Canada
N1  - Includes bibliographical references

ER  -