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He was a son of Fredrik Christian Sejersted ( 1833 – 1882 ) , Lieutenant Colonel and director of the Norwegian Mapping and Cadastre Authority ( then known as Norges Geografiske Oppmåling ) .
 Sejersted, Norwegian Mapping and Cadastre Authority
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sejersted, Norwegian Mapping and Cadastre Authority