Note that the full copy of the yearbook may not be able to be viewed by those not in the US. HathiTrust screens IPs and allows only US-based IPs full viewing of certain material. Links to copies of the book are provided for verification purposes.
Though the book doesn't appear to have been copyrighted, a renewal search was done in books and in periodicals for the years 1956 and 1957. There were no listings for Hull House. There's no evidence of copyright on this year book.
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.