What is the first published date of the pulp magazine by the journalist H. L. Mencken where Chandler's early short stories appeared?
Philip Marlowe:  Chandler's early short stories, published in pulp magazines like "Black Mask" and "Dime Detective", featured similar characters with names like "Carmady" and "John Dalmas". Black Mask (magazine): Black Mask was a pulp magazine first published in April 1920 by the journalist H. L. Mencken and the drama critic George Jean Nathan.
April 1920