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Duplicate Books with Different Covers
The idea of putting different covers on duplicate books or magazines for a book test is Theodore Annemann's, published in his Book Without a Name, 1931; see "The One-Man 'Genuine' Magazine Test", p. 46.
The idea of putting different covers on duplicate books or magazines for a book test is Theodore Annemann's, published in his Book Without a Name, 1931; see "The One-Man 'Genuine' Magazine Test", p. 46.