GIS/LIS '91 :  proceedings / 
sponsored by American Congress on Surveying and Mapping ... [et al.]. 
 - Bethesda, MD :  American Society for Photogrammetry and Remote Sensing :  American Congress on Surveying and Mapping,  1991. 
 - 2 v. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0944426751 (set, pbk.) 094442676X (v. 1, pbk.) 0944426778 (v. 2, pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geography--Data processing--Congresses.<br/>Information storage and retrieval systems--Geography--Congresses.