Explores fundamentals of theory by Hooke, Navier, Cauchy, Green, Kelvin, Stokes, and Betti; key anisotropy papers by Christoffel and Rudzki; fundamentals of reflection and transmission amplitudes by Knott and Zoeppritz; waves by Rayleigh, Love, and Stoneley; the first synthetic seismogram by Lamb; and poroelasticity by Gassmann.