...Fortran.
Kernighan, B.W. and Plauger, P.J., 1976, Software Tools: Addison-Wesley. Ratfor was invented at AT&T, which makes it available directly or through many computer vendors. The original Ratfor transforms Ratfor code to Fortran 66. See http://sepwww.stanford.edu/sep/prof for a public-domain Ratfor translator to Fortran 77.

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...SEP
Old reports of the Stanford Exploration Project can be found in the library of the Society of Exploration Geophysicists in Tulsa, Oklahoma.

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Stanford Exploration Project
12/26/2000