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physical object > person > dead person > 19th century scientist > Humason
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Humason comparison table
Subject has name has domain is a kind of is an instance of is associated with has definition
19th century scientist  dead person  a scientist born between 1800 and 1900 AD
astronomer astronomyscientist  a scientist specializing in astronomy
HumasonMilton La Salle Humasonastronomy 19th century scientistMayall 

Next 19th century scientistLeavitt    Up19th century scientist, astronomer    Previous 19th century scientistHubble