Extraction of High-Energy Particle Information from Cosmic-Ray Emulsion Data

The use of data from cosmic-ray interactions with dense targets is discussed from the point of view of extracting information on $p-p$ interactions at high (cosmic ray) energies. We present a result which relates single-particle inclusive distributions on nuclear targets to single-particle inclusive distributions on nucleons. We show that there exists no serious conflict between present nuclear data and a flat pionization region.