TOPS-10/TOPS-20 COBOL-68 Language Manual

This document provides comprehensive reference material and user guidelines for the COBOL-68 programming language on TOPS-10 (Version 7.01) and TOPS-20 (Version 4). It includes details on the structure of COBOL-68 programs, the four main divisions (Identification, Environment, Data, and Procedure), and various utility programs such as ISAM, LIBARY, and COBDDT. The manual also covers performance optimization techniques, file formats, tape handling, and simultaneous update procedures. It is intended for users with existing knowledge of COBOL and includes multiple appendices for reference.