Cover, 27.10.1982-29.02.1984
Article, 27.10.1982"Loop Cleaning".
Message, 30.03.1983
Letter, F. Allen->A.P. Ershov, 05.07.1983
Letter (hand-written), A.P. Ershov->F. Allen, 31.03.1983
Letter, H. Gerbrandy->A.P. Ershov, 02.11.1983
Telegram, A.P. Ershov->H. Gerbrandy, 22.11.1983
Registration card, 04.10.1983for the article "Loop Cleaning".
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