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