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This comes from "A Report to the City Planning Commission on a Transportation Plan for San Francisco", published in 1948. It was not renewed, as checked via [1]archive copy at the Wayback Machine, and has thus passed into the public domain.
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.
This comes from "A Report to the City Planning Commission on a Transportation Plan for San Francisco", published in 1948. It was not renewed, as checked via [http://www.scils.rutgers.edu/~lesk/copyrenew.html], and has thus passed into the public domain.