Non-accelerator particle physicists, especially those studying neutrino oscillation experiments, will read with profit the in-depth discussions of new results and their interpretations. new guidelines are also set out for new developments in this and related fields. Discussions are presented of neutrino oscillations, neutrino astronomy, high energy cosmic rays, gravitational waves, magnetic monopoles and dark matter. The future large-scale research projects discussed include the experiments on long baseline neutrino beams from CERN to Gran Sasso and Fermilab to the Soudan mine; large underwater and under-ice experiments; the highest energy cosmic rays; gravitational waves; and the search for new particles and new phenomena.

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Contents. 1. Overview. Puzzles in Astrophysics; V. Berezinsky. Status of Neutrino Physics; J.W.F. Valle. 2. Gravitational Waves. Gravitational Waves; B.C. Barish. Energetic Cosmic Rays Observed by the Resonant Gravitational Wave Detector NAUTIILUS; F. Ronga. 3. Magnetic Monopoles. Magnetic Monopoles; G. Giacomelli, L. Patrizii. Monopole Catalysis of Nucleon Decay: Theory and Experimental Results; M. Sitta. Search of Slow Magnetic Monopoles with the MACRO Scintillation Detector; S. Kyriazopoulou. Nuclear Track Detectors. Searchers for Magnetic Monopoles and for Nuclearites; M. Cozzi, L Patrizii. 4. Neutrino Oscillations. The Prediction of the Atmospheric Neutrino Fluxes; P. Lipari. Atmospheric Neutrinos and Neutrinos Oscillations in the MACRO Experiment; F. Ronga. Neutrino Oscillation Results from SuperKamiokande and Soudan 2; D. Michael. Estimate of the Energy of Upgoing Muons with Multiple Coulomb Scattering; D. Bakari, et al. Neutrino Induced Upgoing Muon Energy Estimation by Multiple Scattering with MACRO; G. Battistoni, et al. Some Neutrino Oscillation Experiments in the USA; C.W. Peck. Update on MINOS; D. Michael. The Experimental Program with the CNGS Neutrino Beam; M. Spinetti, A. Ereditato. A Fully Radiative Model to Solve the Neutrino Puzzles; A. Bouchareb, J. Mimouni. `Exotic' Neutrino Oscillations; V. Popa, M. Rujoiu. 5. Neutrino Astronomy. High Energy Neutrino Astronomy and WRAP Search Results; T. Montaruli. Underwater Neutrino Detectors; L. Moscoso. Search for the Diffuse Neutrino Flux From Astrophysical Sources; L. Perrone. A Search for Gravitational Stellar Collapses; M. Grassi. 8. Solar Neutrinos. Solar Neutrinos and Magnetic Effects: Status Review and Prospects; J. Derkaoui. Resonance Spin Flavour Precession and Solar Neutrinos; Y. Tayalati, et al. 7. Cosmic Rays. Detecting Cosmic Rays of the Highest Energies; F. Vannucci. Cosmic Ray Composition Around the Knee: Where Are We?; M. Sioli. Long-Term Variations of Cosmic Rays in a Time-Varying Heliosphere; G. Exarhos, X. Moussas. Muon Astronomy with the Underground Detectors; H. Dekhissi. Daily Variations Studies with the Macro Detector; F. Maaroufi, A. Margiotta. Proton-Proton Total Cross Section at Very High Energies from Accelerators and Cosmic Rays; J. Velasco. 8. Space Experiments. Future Cosmic Ray Experiments in Space; S. Cecchini, T. Chiarusi. Study of Galactic Electron-Positron Annihilation in the INTEGRAL Era; N. Guessoum. 9. Dark Matter. Cosmological Implications of Massive Neutrinos; L.A. Popa. Intermediate Unification Scale and Neutralino-Nucleon Cross Section; D.G. Cerdeño, et al. 10. Various. First Measurements of Indoor and Outdoor Radon Concentrations in Oujda, Morocco; R. Giacomelli, et al. Computing at Future Accelerator and non-Accelerator Large Experiments; P. Capiluppi, et al. 11. Round Table. A Round Table on the Future of Particle Astrophysics; P. Lipari, et al.