mult.f: A FORTRAN subroutine for predicting free-surface multiples (see Introduction to Petroleum Seismology, Chapter 10 for more details).

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fkmigvel.f: A FORTRAN subroutine for migration-velocity analysis (see Introduction to Petroleum Seismology, Chapter 11 for more details).

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fd2d.f: A FORTRAN code for finite-difference modeling (see Introduction to Petroleum Seismology, Appendix C for more details).

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wave.f: A FORTRAN code for constructing P- and S-wavefronts (see Introduction to Petroleum Seismology, Chapter 12 for more details).

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