Series:Famous Fantastic Mysteries

From Tuck's Encyclopedia of Science Fiction and Fantasy:

      A magazine founded to reprint fantasy and sf material from the old
    Frank A. Munsey magazines (Argosy, All-Story, etc.). It became popular
    in its initial year. Some novels were serialised in the early issues, until
    the companion Fantastic Novels was started and began publishing complete
    novels. (The latter, however, had only 5 issues at that time and was combined
    back into FFM). The covers were only coloured story listings until
    Feb 1940, when paintings by F. Paul and V. Finlay began.
      After FFM was bought by Popular Pubs, in 1943 the fiction policy
    changed to the reprinting of novels that had previously appeared only in
    book form. Some quite good works were presented; these are covered below.
    From Aug 1947 to Apr 1950 there was a section "Masters of Fantasy" (drawings
    and a short appreciation) by N. Austin. The magazine became "streamlined"
    from Jan 1951 - smaller in size and with no advertisements - but soon returned
    to its older format. Lawrence was the principal artist; in conjunction with
    Fantastic Novels, portfolios of work by Lawrence and V. Finlay were
    published.
      Popular's FFM also had Fantastic Novels (2nd series) as a companion 
    for a period, as well as A. Merritt's Fantasy and Super Science Stories'
    (2nd series). The Munsey FFM was used as a source for the fiction in the 
    Canadian Super Science (Feb 1945 - Dec 1945).