Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to W. H. Smith Esquire; The Engineer's Year Book, 7 Stationer's Hall Court, Ludgate Hill, E.C.4. Informs Mr. W. H. Smith that they have not yet received a copy of the [Engineer's] Year Book at the Society, however, expect that the 1920 copy will serve their purposes until the end of 1921 too. 20 April 1921