The next recorded visitors to the area were the American explorer Lincoln Ellsworth and his Australian aircraft pilot and observer, Sir Hubert Wilkins in Ellsworth's ship the Wyatt Earp. Despite Wilkins' protestations that Mawson had already claimed the area for Australia, Ellsworth planned to lodge a counter claim for America. In response to this, Wilkins took pre-emptive action and made two landings. The first was on one of the Rauer Islands, at 68° 46' South, 77° 50' East on 8 January 1939, and the second on a rocky outcrop at 68° 22' South 70° 33' East on 11 January 1939. At both of these locations he deposited decrees recognising Australia's right to ". . . administrate . . . those parts of His Majesty's dominions in the Antarctic Seas". Along with the decree he left a copy of the famous Australian geographical magazine 'Walkabout". Of three such sites, only the northern cairn has been located and hence the name "Walkabout Rocks".