| Business | Phone |
| Roger N Smith Assoc Inc 800 Nw 6th Ave # 318, Portland 97209 | (503) 241-5444 |
| Geology & Mineral Ind Dept 800 Ne Oregon St # 965, Portland 97232 | (503) 731-4100 |
| Northwest Geological Svc Inc 2505 Ne 42nd Ave, Portland 97213 | (503) 249-1093 |
| Grant Associates Inc 1017 Se 34th Ave, Portland 97214 | (503) 234-4299 |