With Translated Reprints by O Klein The Oskar Klein Memorial Lectures, instituted in 1988 and supported by the Royal Swedish Academy of Sciences through its Nobel Committee for Physics, are given at Stockholm University in Sweden, where Oskar Klein was professor in Theoretical Physics 1930-1962. Volume 1 contains the 1988 lectures on "Symmetry and Physics" and From the Bethe-Hulth n Hypothesis to the Yang-Baxter Equation, given by C N Yang, Nobel Prize winner (1957) and professor at the State University of New York at Stony Brook. The 1989 lectures on Beyond the Standard Models, referring to...