Technikatörténeti szemle 19. (1992)
TANULMÁNYOK - Bartha, Lajos: In Memoriam Miklós Konkoly Thege (1842–1916)
2 Konkoly's observatory in the park of his estate at Ogyalla, in the mid 1870s
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2 Konkoly's observatory in the park of his estate at Ogyalla, in the mid 1870s