ACI 318-47 refers to the “Building Code Requirements for Reinforced Concrete” published by the american-concrete-institute in September 1947 (p. 336).
The city-of-miami adopted this standard as part of Ordinance No. 3703 (1949) to amend Chapter 26 of the 1935-miami-dade-building-code (p. 336). This adoption updated the city’s requirements for reinforced-concrete-design, ensuring that reinforced concrete structures complied with the latest national engineering standards (p. 336).
See 1935-Miami-Dade-Building-Code_p325_344 for details on the ordinance adoption.