By A Mystery Man Writer
Two helicopters refueling hi-res stock photography and images - Alamy
Helidecks - an overview
Aviation – GISSCO
Helicopter Refueling System - Helidex
CH-53K King Stallion demonstrates first air-to-air refuelling
Helicopter Refueling System, Aviation, Aircraft Refueling Tank
Can Helicopters Refuel in Flight? – Pilot Teacher
Helicopter Refueling System, Aviation, Aircraft Refueling Tank
Helicopter Refueling Package Specification, PDF
Helicopters: How large is the fuel tank on the Bell 429? - Quora