Two FORTRAN programs

I have 2 different FORTRAN programs (quite big programs). Let us call program 'A' and 'B'

My program 'B' needs to use a subroutine of program A (exactly the same subroutine). I do not want to copy/paste this.

Is it possible to call that subroutine of A from a subroutine of B?

Any examples will be appreciated.

Kindest Regards, Peter

One way to do this is to put the 'subroutine of program A' into a separate file and to use an INCLUDE statement for this code in both program A and program B.

Or you could compile the subroutine separately, and link the OBJ file with both programs.