Draft letter of N.K. Krupskaya to A.G. Shlyapnikov on the need to establish correspondence with chemical ink with a message of ciphers for correspondence.
Draft letter of N.K. Krupskaya to A.G. Shlyapnikov on the need to establish correspondence with chemical ink with a message of ciphers for correspondence.
October 6 [1916].
РГАСПИ.Ф.17.Оп.1. Д.1884. Л.1,2об.