1. USDA Agricultural Research Service; National Sedimentation Lab.; PO Box 1157 Oxford MS 38655 USA
2. USEPA Region IX; Sacramento CA 95814 USA
3. Yolo County Resource Conservation District; Woodland CA 95695 USA
4. Aqua-Science; Davis CA 95616 USA
5. Univ. of California at Davis; Aquatic Toxicology Lab.; Davis CA 95616
6. California Dep. of Fish and Game; Rancho Cordova CA 95670 USA