Mathematical Tables Project

The Mathematical Tables Project was one of the largest and most sophisticated computing organizations that operated prior to the invention of the digital electronic computer. Begun in the United States in 1938 as a project of the Works Progress Administration (WPA), it employed 450 clerks to tabulate higher mathematical functions, such as exponential functions, logarithms, and trigonometric functions.

Source: Wikipedia — Mathematical Tables Project (CC BY-SA 4.0)