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physical object > person > dead person > 19th century scientist > van Maanen
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van Maanen comparison table
Subject has name has domain has career is a kind of is an instance of has definition
19th century scientist   dead person a scientist born between 1800 and 1900 AD
astronomer astronomy scientist a scientist specializing in astronomy
van MaanenAdrian van MaanenastronomyMt. Wilson 19th century scientist 

Next 19th century scientist: Annie Jump Cannon    Up: 19th century scientist, astronomer    Previous 19th century scientist: Slipher