1. The Sanborn Map Company, Inc.
sub: EMC, Inc.
sub: Optimal Geo, Inc.
2. Continental Mapping Consultants, Inc.
sub: Surdex Corp.
sub: Bureau of Economic Geology, U.T. @ Austin
sub: CH Fenstermaker & Associates, L.L.C.
sub: Civil Design & Construction, Inc.
3. GPI Geospatial, Inc.
sub: Forte & Tablada, Inc.
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