Advances in Methodology.- Temperature Control.- Interaction of Ultrasound with M¿ssbauer Gamma Rays.- M¿ssbauer Effect by Recoil Implantation Through Vacuum.- Coulomb Excitation Techniques in M¿ssbauer Methodolog.- Analysis of Complex M¿ssbauer Spectra by Stripping Techniques.- Cobaltous Oxide (I): A Compact Single-Line Source.- Applications in Materials Investigation.- Enzyme Studies with the M¿ssbauer Effect.- A One-Sided View of M¿ssbauer Spectroscopy.- Magnetic Hyperfine Interactions in Some Spinel Ferrites.- Magnetic Critical-Point Behavior in Fluorides of Iron.- Effect of Cation on the M¿ssbauer Spectra of Tetrahaloferrate Anions.- Solid-Solution Strengthening in Fe¿Cr Alloys Using M¿ssbauer Spectroscopy.- New M¿ssbauer States: Methodology and Application.- Methodology of the Np237 M¿ssbauer Effect.- M¿ssbauer Spectroscopy with Ni61.