Book excerpt: The Quarks '86 Seminar brought together scientists from leading centres on high energy physics from the USSR and many other countries, including the USA to discuss the latest developments and achievements in the field of high energy physics, quantum field theory and astrophysics. The proceedings volume contains 45 papers and covers the following topics: vacuum structure in gauge theories; QCD and the quark confinement problem; supersymmetry, supergravity and models in many-dimensional space-time; processes with large transverse momenta and multiloop calculations in quantum chromodynamics; models of Grand Unification; models of composite quarks and leptons; problems of astrophysics and cosmology; quarks degree of freedom in nuclear physics.