I. Introduction -- A Brief Overview of Millimeter-Wave Astronomy -- II. Solar System -- Millimeter-wave Spectroscopy in the Solar System -- III. Molecular Clouds and Star Formation in the Galaxy -- Molecular Clouds and Massive Star Formation in the Galactic Disk -- Probing Molecular Clouds - Their Density and Structure -- Interstellar Cloud Structure, Fragmentation, and Protostar Formation -- Polarimetry and Magnetic Fields -- Masers -- Energy Budget and the Virial Theorem in Interstellar Clouds -- Turbulence in Molecular Clouds -- Shocks and PDRs -- Low Mass Star Formation -- New Protostellar Collapse Candidates: An HCO+ Survey of the Class 0 Sources -- 1.3mm Dust Continuum Observations of X-ray Selected T Tauri Stars in Ophiuchus -- The Excitation of Molecular Hydrogen in XDRs -- High Density H2-HII Interfaces in Orion -- IV. Beyond The Galaxy -- External Galaxies 1. CO Observations of Galaxies -- External Galaxies 2. Other Molecular Lines, Recombination Lines, and Continuum -- Cosmic Microwave Background -- Extragalactic and Galactic Submillimetric Emission -- V. Chemistry and Molecular Structure -- I. Molecules in Space and Molecular Spectroscopy -- Chemical Processes in Interstellar Space -- Models of Interstellar Chemistry -- Interstellar CH+ - An Outstanding Enigma -- On the Calculation of Rotational Constants of Interstellar Molecules -- V. Instrumentation For MM/Submm Astronomy -- Some Radio Telescope Considerations in Millimeter and Submillimeter Radio Astronomy -- Millimeter Wave Heterodyne Receivers and Focal Plane Arrays -- Spectrometers for Radio Telescopes -- Millimeter Wave Bolometers.