  There exists a longstanding disagreement between bubble chamber measurements
of the single pion production channel $\nu_{\mu}p\rightarrow \mu^{-}p\pi^{+}$
from the Argonne and Brookhaven National Laboratories. We digitize and
reanalyse data from both experiments to produce cross-section ratios for
various interaction channels, for which the flux uncertainties cancel, and find
good agreement between the experiments. By multiplying the cross-section ratio
by the well-understood charged current quasi-elastic cross-section on free
nucleons, we extract single-pion production cross-sections which do not depend
on the flux normalization predictions. The $\nu_{\mu}p\rightarrow
\mu^{-}p\pi^{+}$ cross-sections we extract show good agreement between the ANL
and BNL datasets.
