The last compilation of nuclear levels was published in the New Series of Landolt-Boernstein in Volume I/1 in 1961. Since that time an enormous amount of new experimental data has been collected and hence a new compilation, Volume I/18, has been conceived. The data are subdivided into various chapters according to the nuclear charge Z and distributed over three subvolumes. The present subvolume I/18C is covering nuclei with Z = 63 to Z = 100. For each nucleus an energy level diagram provides a schematic representation of the level structure, together with information on spin and parity, and excitation energy of the levels, as well as gamma-transitions between the levels. Mass excess, and separation energies for neutron and proton, are also given. Tables provide additional information on the properties of the individual levels, for instance, quadrupole and magnetic moment, beta and electron capture decays, reduced transition probabilties for gamma-decays, main nuclear reactions in which the level has been populated, etc.