  We discuss the production of charmonium states in antiproton-nucleus
collisions at the $\psi'$ threshold. It is explained that measurements in $\bar
p A$ collisions will allow to get new information about the strengths of the
inelastic $J/\psi N$ and $\psi'N$ interaction, on the production of $\Lambda_c$
and $\bar{D}$ in charmonium-nucleon interactions and for the first time about
the nondiagonal transitions $\psi' N\to J/\psi N$. The inelastic
$J/\psi$-nucleon cross section is extracted from the comparison of
hadron-nucleus collisions with hadron-nucleon collisions. Predictions for the
ratio of $J/\psi$ to $\psi'$ yields in antiproton-nucleus scatterings close to
the threshold of $\psi'$ production for different nuclear targets are
presented.
