  We report on a detailed study of longitudinal strength in the nucleon
resonance region, presenting new results from inclusive electron-proton cross
sections measured at Jefferson Lab Hall C in the four-momentum transfer range
0.2 < Q^2 < 5.5 GeV^2. The data have been used to accurately perform 167
Rosenbluth-type longitudinal / transverse separations. The precision R =
sigma_L / sigma_T data are presented here, along with the first separate values
of the inelastic structure functions F_1 and F_L in this regime. The resonance
longitudinal component is found to be significant, both in magnitude and in the
existence of defined mass peaks. Additionally, quark-hadron duality is here
observed above Q^2 = 1 GeV^2 in the separated structure functions
independently.
