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Edward Humphrey, Ph.D.. (1977). Encyclopedia International 20 INDEX (1). USA: Lexicon Publications.

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Edward Humphrey, Ph.D.. Encyclopedia International 20 INDEX. 1 USA: Lexicon Publications, 1977. Text.

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Edward Humphrey, Ph.D.. Encyclopedia International 20 INDEX. 1 USA: Lexicon Publications, 1977. Text.

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Edward Humphrey, Ph.D.. Encyclopedia International 20 INDEX. 1 USA: Lexicon Publications, 1977. Print.