| Ports (Electrionic bus. Matches 1 item |
| Ports (Electronic computer systems) Matches 1 item |
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Portsmouth Naval Base (U.S.) -- History -- 20th century. SEE: Portsmouth Naval Shipyard (U.S.) -- History -- 20th century. Matches 1 item
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| Portsmouth Naval Shipyard (Portsmounth, N.H.) -- History. Matches 1 item |
| Portsmouth Naval Shipyard (U.S.) Matches 1 item |
| Portsmouth Naval Shipyard (U.S.) -- History -- 20th century. Matches 1 item |
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Portsmouth Navy Yard (U.S.) -- History -- 20th century. SEE: Portsmouth Naval Shipyard (U.S.) -- History -- 20th century. Matches 1 item
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Portsmouth, R.I -- History -- Colonial period, ca. 1600-1775. SEE: Portsmouth (R.I.) -- History -- Colonial period, ca. 1600-1775 Matches 1 item
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| Portsmouth (R.I.) -- History -- Colonial period, ca. 1600-1775. Matches 1 item |
| Portsmouth (Va.) -- History. Matches 1 item |