Rare R H Barlow Signature

From Terence McVicker (epegana) colection on the ebayeum, he states:

ROBERT H. BARLOW TO HOWARD WANDREI SIGNED - CIRCA 1934
Robert H. Barlow was a protege of Howard Phillips Lovecraft; indeed HPL thought so much of RHB that he made him executor after his death and Barlow inherited his papers and library.In the '30's Barlow was trying to build a collection of not only weird literature manuscripts and books, but also original artwork and loans of artwork he could photograph. With HPL's help he solicited materials from virtually every big name in the field; Howard Wandrei was a much underrated artist that Barlow particularly enjoyed. In this letter Barlow tells Wandrei that his artwork was returned and would have it traced if he didn't receive it. Signed in fountain-pen "RHBarlow".