Letter, W. Dijkhuis->A.P. Ershov, 30.07.1981 The author confirms that the direct expenses will be covered
Letter, A. S. Alekseev->V. V. Pazelskiy, 04.08.1981
Letter, I. I. Geitsi ->V. V. Pazelskiy, 24.08.1981
Cover Letter, 25.08.1981
Directives, I. I. Geitsi ->A.P. Ershov, 25.08.1981
Justification, 25.08.1981(?)
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