Review.- General Superconductor Theory, Measurement, and Processing.- Low Temperature Superconductors — Nb3Sn.- Low Temperature Superconductors — NbTi.- Low Temperature Superconductors — Newer Materials.- High Temperature Superconductors — YBCO.- High Temperature Superconductors — Bi-Based.- High Temperature Superconductors — Other Ceramics.- Pure Metal Cryoconductors.- Magnetic Materials.