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The Preface and some of the alterations and additions are in Marx 's hand ; the bulk of the manuscript , however , is in Engels ' hand , except for Chapter V of Volume II and some passages of Chapter III of Volume I which are in Joseph Weydemeyer 's hand .
 Marx, Engels
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marx, Engels