11. Discovered and plotted from air photos by peak cirque ). 12. Mapped by ANARE ( Australian National Antarctic Research Expeditions ) from air photos , 1956-60. 13. Plotted from ANARE ( Australian National Antarctic Research Expeditions ) air photos of 1965. 14. A study of air photos has shown that there are two groups of rocks. 15. Mapped from air photos taken by U . S . Navy Operation Highjump, 1946-47. 16. Mapped by USGS from surveys and U . S . Navy air photos , 1964-68. 17. Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37. 18. Discovered and plotted from air photos by peak ridge ). 19. Mapped by Norsk Polarinstitutt from surveys and air photos by Norwegian Antarctic Expedition, 1956-60. 20. Plotted from ANARE ( Australian National Antarctic Research Expeditions ) air photos taken in 1960.
