SAGEEP '98 - Eleventh Annual Symposium on the Application of Geophysics to Environmental and Engineering Problems (Chicago, Illinois)

GPR '98 - Seventh International Conference on Ground-Penetrating Radar (Lawrence, Kansas)

SEG '97 - SEG International Exposition, 67th Annual Meeting (Dallas, Texas)

AGU 1998 Spring Meeting- American Geophysical Union 1998 Spring Meeting (Boston, Massachussetts)