  Inclusive electron scattering at carefully chosen kinematics can isolate
scattering from short-range correlations (SRCs), produced through hard,
short-distance interactions of nucleons in the nucleus. Because the two-nucleon
(2N) SRCs arise from the same N-N interaction in all nuclei, the cross section
in the SRC-dominated regime is identical up to an overall scaling factor, and
the A/2H cross section ratio is constant in this region. This scaling behavior
has been used to identify SRC dominance and to map out the contribution of SRCs
for a wide range of nuclei. We examine this scaling behavior at lower momentum
transfers using new data on $^2$H, $^3$H, and $^3$He which show that the
scaling region is larger than in heavy nuclei. Based on the improved scaling,
especially for $^3$H/$^3$He, we examine the ratios at kinematics where
three-nucleon SRCs may play an important role. The data for the largest initial
nucleon momenta are consistent with isolation of scattering from 3N-SRCs, and
suggest that the very-highest momentum nucleons in $^3$He have a nearly
isospin-independent momentum configuration, or a small enhancement of the
proton distribution.
