1. Total Proton-Proton Cross Section ats12=30TeV
2. Inelasticp-Air Cross Section at Energies between1016and1018eV Estimated from Air-Shower Experiments
3. 4. Note that if the distribution were for shower starting points, then the corresponding A would be the interaction length. Unfortunately, shower starting points are invisible to any air shower experiment.
4. 5. T. Stanev, T. K. Gaisser, M. L. Cherry, K. Lande, and R. I. Steinberg . 1982 . Proceedings of the Workshop on Very High Energy Cosmic Ray Interactions . : 125 . University of Pennsylvania Press. Philadelphia.