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The 1964 ACM Computing Classification System

Categories of the Computing Sciences [1964 version]

Classification System for Computing Reviews

Prior to 1982, an older classification system first introduced in 1964 was used, which involved content indicators of two types (described in more detail in this introduction): (a) appropriate key words and phrases and (b) category numbers from a three-level tree.

The full 1964 CR classification tree is available as a single document, or as an ascii file.