πp elastic scattering from 67 to 139 MeV

Measurements of ${\pi }^{\pm }$p elastic differential cross sections have been made at seven incident pion energies from 66.8 to 138.8 MeV. These measurements have statistical accuracy of 1.5–3.3?for ${\pi }^{+}$ and 2.7–19.0?for ${\pi }^{\mathrm{-}}$. The absolute normalization uncertainties are 1.2–2.5?for ${\pi }^{+}$ and 1.2–3.2?for ${\pi }^{\mathrm{-}}$. Extensive tests were made to ensure that systematic errors were properly evaluated.