P2V Neptune
Avgas Dinosaur
Re your book. I have a book , not for sale, that may provide the information you are looking for.
The Black Bats by Chris Pockock and published by Schiffer Military History Books. The sub title, Cia spy Flights Over China From Taiwan.
One of the last chapters mentions Operations by P2VS into North Vietnam,
The book a number of photographs of P2V and RB69
I obtained my book from that well known SA River