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Patrol Boat, River - Wikipedia
Arsenal: The river patrol boat was the backbone of the Brown Water Navy
Mark VI patrol boat - Wikipedia
Brown Water Navy in Vietnam | Naval Historical Foundation
Brown Water Navy: Patrol Boat, Riverine (PBR) - NHHC
PBRs: The US Navy’s Small and Nimble Watercraft In Vietnam
The Essential Role of Navy PBR Boats in the Vietnam War
Arsenal: The river patrol boat was the backbone of the Brown Water Navy
Patrol Boat Riverine - National Navy UDT-SEAL Museum
Patrol Boat River (PBR) Lethality in Vietnam - The Sextant