  We investigate the effect of deviations from general relativity on approach
to the initial singularity by finding exact cosmological solutions to a wide
class of fourth-order gravity theories. We present new anisotropic vacuum
solutions of modified Kasner type and demonstrate the extent to which they are
valid in the presence of non-comoving perfect-fluid matter fields. The infinite
series of Mixmaster oscillations seen in general relativity will not occur in
these solutions, except in unphysical cases.
