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physical object > person > dead person > 19th century scientist > Pickering
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Pickering comparison table
Subject has name has domain is a kind of is an instance of has greatest achievement has image has definition has career
19th century scientist  dead person   a scientist born between 1800 and 1900 AD 
astronomer astronomyscientist   a scientist specializing in astronomy 
PickeringEdward C. Pickeringastronomy astronomerthe Henry Draper Catalog of spectral types Havard College Observatory

Next 19th century scientist: Shapley    Up: 19th century scientist, astronomer    Previous 19th century scientist: Otto Struve