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In addition , he published two volumes of criticism , Opposing Poetries : Volume One — Issues and Institutions and Opposing Poetries : Volume Two — Readings with Northwestern University Press ( 2006 ) , and edited a collection of essays by various writers and critics ( including Helen Vendler ) , What is a Poet ?
 Northwestern University Press, Helen Vendler
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Northwestern University Press, Helen Vendler