Albert Einstein signed documents

(lot of 2) Albert Einstein signed copy of The Unified Field Theory, Berlin 1929, signed upper left and dated 22.1.31, and a signed presentation letter to Reginald B. Haselden dated February 1, 1931 on California Institue of Technology stationary stating (roughly) "Esteemed Mr Haselden: Many thanks for the excellent attention. The young man is a radiant example for a peaceful way of life that I would like to follow. Yours Sincelrey, A. Einstein" Provenance: Reginald Haselden, former curator of the Manuscript Department at the Huntington Library, California