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find the training resources you need for all your activities. studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn..handbook of paper and board edited by herbert holik,in europe, cepi has conducted recovered paper surveys which found, for 2002, the following five sources of recovered paper: • recovered paper from households: 38% • recovered paper from trade and industry: 33% • recovered paper from converting and printing: 15% • recovered paper from offices: 10% • recovered paper from unsold newspapers and magazines: 4%.