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