It is currently not possible to apply the theory of strong interactions,
QCD, to compute non-perturbative hadron interaction cross sections from
first principles. Thus high quality hadronic particle production
measurements are needed to fully understand the data from experiments
that have hadronic interactions as a signal or background. This includes
atmospheric and accelerator neutrino experiments, calorimetry and
hadronic shower simulation. Such data can also be used to test observed
regularities in particle production such as scaling relations in
inclusive reactions with some precision. The spectrum of baryon
resonances predicted by QCD includes many states that have not been
observed. Measurements with pion, kaon, and proton beams on a liquid
hydrogen target at beam momenta around 1 GeV/c will provide important
input to searches for missing baryon resonances. We review status,
results, and prospects of particle production measurements at Fermilab
(MIPP).