Part 2 contains brief discussions of some of the primary data sources for research in atmospheric science, and is intended as an introductory guide to common sources of observations in atmospheric science. Part 2 contains brief descriptions of some of the primary sources of experimental data in atmospheric science. The material, prepared by experimental meteorologists, illustrates how data are acquired and used in current research projects, and shows the variety of data sources and approaches that are in current use. This material is based on presentations at the NCAR 1992 Summer Colloquium on Observational Techniques (1-19 June 1992). Notes by the students attending that colloquium and material prepared by the lecturers and participants were used as the basis for Part 2.