Kovalev

28 October 1939
Russian State Archive of Contemporary History
Coll. 3, ser. 65, fold. 990, ff. 109–113.
Certified copy
10 November 1939
Russian State Military Archive
Coll. 35086, ser. 1, fold. 245, ff. 9–10.
Original
17 April 1940
Russian State Archive of Social and Political History
Coll. 558, ser. 11, fold. 1124, ff. 8–43.
Deciphered shorthand transcript