Ulrich's international periodicals directory 1971-72 - New York: R.R. Bowker Co., 1971 - v.p.

Sanction dt. 15/07/1981(wdr no.247;acc. no.5825)
Sanction dt. 15/07/1981(wdr no.246;acc. no.5826)

v. 1 A-L
v. 2 M-Z

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