Textbook in PDF format

Galactic and Extragalactic Radio Astronomy is a fundamental text for graduate students and professional astronomers and covers all aspects of radio astronomy beyond the solar system. Each chapter is written by a renowned expert in the field and contains a review of a particular area of radio astronomy and presents the latest observations and interpretations as well as an extensive view of the literature (as of 1988).
Preface
Galactic Nonthermal Continuum Emission
HII Regions and Radio Recombination Lines
Neutral Hydrogen and the Diffuse Interstellar Medium
Molecules as Probes of the Interstellar Medium and of Star Formation
Interstellar Molecules and Astrochemistry
Astronomical Masers
The Structure of Our Galaxy Derived from Observations of Neutral Hydrogen
The Galactic Center
Radio Stars
Supernova Remnants
Pulsars
Extragalactic Neutral Hydrogen
Radio Galaxies and Quasars
The Microwave Background Radiation
Radio Sources and Cosmology