The notice is on page 2 and it doesn't say anything about copyright. The photograph itself gives no photographer, nor is one listed for the volume that I could find. I searched the Catalog of Copyright Entries in the Books/pamphlets and periodicals. Neither 1949 or 1950 show anything for books or 1949 or 1950 periodicals.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.