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The history of the Neptune has been well documented by P2VNeptune.com and VPNAVY.org

Please see the links below for detailed history and squadron information!!

p2vneptune.com: Lockheed P2V-7/P-2H Neptune
VPNAVY - United States Navy Patrol Squadrons
VP-21 & VPB-111 Veterans Association

References: P2VNEPTUNE.ORG - Neptune Bibliography
Plastic Models: p2vneptune.com: Lockheed P2V Neptune Models