In the autumn of 1977, sometime after my paper on salt production in Otoγ had been published, while searching for something of an entirely different nature, unexpectedly I discovered tucked away in a book from the library formerly belonging to the late Antoine Mostaert, another letter dealing with the same question of salt. It consists of one sheet of Chinese paper measuring 443 X 248 mm., with 25 lines of text: the copy of a letter of one of the ministers of the Banner of Otoγ addressed to another Banner functionary; the very last line evidently is not part of the letter but is a note whereby the addressee forwards this copy to somebody who remains unidentified, perhaps the resident priest of Boro-Balyasun; the church indeed had been involved in the salt negotiations and is also mentioned in the letter.