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IIRC there was no INCLUDE in FORTRAN77 and the COMMON block would sometimes have different names for the same variable in different subroutines. Also the structure of the code we had to maintain (some of which was pre-FORTRAN77) was so horrific, that we would run it through a program called SPAG to clean it up. Happy days!

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"...An important practical extension to FORTRAN 77 was the release of MIL-STD-1753 in 1978. This specification, developed by the U.S. Department of Defense, standardized a number of features implemented by most FORTRAN 77 compilers but not included in the ANSI FORTRAN 77 standard. These features would eventually be incorporated into the Fortran 90 standard.

- DO WHILE and END DO statements

- INCLUDE statement"

- IMPLICIT NONE variant of the IMPLICIT statement

- Bit manipulation intrinsic functions,..." [1]

[1]: https://fortranwiki.org/fortran/show/FORTRAN+77

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