Ulrich's International Periodicals Directory. Vol. 1 - R.R.Bowker Company (New York R.R.Bowker Copany, 1971)
R.R.Bowker Company: Ulrich's International Periodicals Directory. Vol. 1. (Ed. 14) New York. R.R.Bowker Copany, 1971.--(050UIPD)
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