Regretting that Ershov could not come to the USA, and sending interesting papers from the last conferences

The author is sorry that Ershov could not come to Boston; he is discussing the ways of inviting foreign scientists under the exchange conditions, and the conferences that Ershov might attend depending on the time of his visit; promises to help with the books for Ershov's son

about invitation for A.P. Ershov to read lectures in the USA

proposals on the return visit program of the USA scientists after A.P. Ershov’s trip

Thanks for the letter and a promise to write later about the talks with Academicians Sobolev and Dorodnitsyn and the summer conference