Subject
- Barges -- Northwest, Pacific -- Congresses3
- Cargo ships -- Northwest, Pacific -- Congresses3
- Coastwise shipping -- Northwest, Pacific -- Congresses3
- Merchant marine -- Northwest, Pacific -- Congresses3
- Shipping -- Northwest, Pacific -- Congresses3
- Inland water transportation -- Northwest, Pacific -- Congresses2
- Inland water transportation -- Northwest, Pacific1
- Inland water transportation -- Northwest, Pacific Congresses1