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Hawaii Volcanoes National Park. Calibrating the magnetometers inside the Observatory library. From left to right: Ruy Finch, Gordon Macdonald, Burt Loucks, and Joel Swartz. 1950.
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Hawaii Volcanoes National Park. Fractured basalt in a pressure ridge just north of Halemaumau pit on the floor of Kilauea caldera. Caldera wall is in the background. Volcano House hotel on top of the cliff near the left. Byron Ledge and Kilauea Iki at the extreme right, partially included. 1950.
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Hawaii Volcanoes National Park. Joel Swartz, Hank Joesting, and Gordon Macdonald at the entrance to the seismograph station near the end of the Mauna Loa truck trail, at an elevation of approximately 7,000 feet. 1950.
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Hawaii Volcanoes National Park. Back of the Hawaiian Volcano Observatory, viewed from the Uwekahuna Base Station. The observation platform can be seen to the right of the building. The small figures are believed to be, left to right, Gordon Macdonald and Ray Wilcox. 1950.
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Hawaii Volcanoes National Park. East across Halemaumau Crater and Kilauea caldera floor, viewed from near the Observatory. The caldera walls are in the background. 1950.


    map background search result map search result map Mauna Loa truck trail. Hawaii Volcanoes National Park.1950. Hawaiian Volcano Observatory, Hawaii Volcanoes National Park. 1950. Calibrating the magnetometers inside the Observatory library. Hawaii Volcanoes National Park. 1950. Fractured basalt in a pressure ridge. Hawaii Volcanoes National Park. 1950. Ropy crust of pahoehoe lava on the crater floor. Kilauea Volcano, Hawaii Volcanoes National Park. 1950. Halemaumau Crater and Kilauea caldera floor. Hawaii Volcanoes National Park. 1950. Mauna Loa truck trail. Hawaii Volcanoes National Park.1950. Hawaiian Volcano Observatory, Hawaii Volcanoes National Park. 1950. Calibrating the magnetometers inside the Observatory library. Hawaii Volcanoes National Park. 1950. Fractured basalt in a pressure ridge. Hawaii Volcanoes National Park. 1950. Ropy crust of pahoehoe lava on the crater floor. Kilauea Volcano, Hawaii Volcanoes National Park. 1950. Halemaumau Crater and Kilauea caldera floor. Hawaii Volcanoes National Park. 1950.