1. Univ. of Iowa; IIHR-Hydroscience and Engineering, 306 C. Maxwell Stanley Hydraulics Laboratory; Iowa City IA 52242
2. Univ. of Iowa; IIHR-Hydroscience and Engineering, 332 Trowbridge Hall; Iowa City IA 52242
3. Iowa Geological Survey, 334 Trowbridge Hall; Iowa City IA 52242