This comes from "Transportation Section of the Master Plan of San Francisco", published in 1955. 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 "Transportation Section of the Master Plan of San Francisco", published in 1955. It was not renewed, as checked via [http://www.scils.rutgers.edu/~lesk/copyrenew.html], and has thus passed into the public domain. [[Category:Maps of San Fr