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( cover-dated Nov. 1950 – May 1952 ) after editor Robert O. Erisman , and began writing for the company 's comic-book lines Atlas Comics , the 1950 s precursors of Marvel Comics .
 person: Robert O. Erisman; organization: Atlas Comics; organization: Marvel Comics
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Robert O. Erisman; organization: Atlas Comics; organization: Marvel Comics