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Message * Articles On M-type Asteroids, including 16 Psyche, M-type Asteroid, 21 Lutetia, 216 Kleopatra, 69 Hesperia, 75 Eurydike, 77 Frigga, 92 Undina, 97 Klotho, 110 Lydia, 125 Liberatrix, 129 Antigone, 132 Aethra, 135 Hertha, 136 Austria - 1243230851 - 9781243230850