The report describes the results of a survey of available pre-1980 micrometeorological and tracer data sets. The purpose of the report is to: identify data of potential interest for archiving and provide information about the general character of the body of data of interest. This latter information is of interest to guide the design of the archive structure and documentation, and archiving procedures. The assessment identified 22 micrometeorological and 41 tracer diffusion data sets of primary interest for potential future archiving. The survey addressed data sets for relatively flat rural terrain with small to moderate roughness elements. Only diffusion studies with controlled tracer releases were considered. From these, a subset of 5 micrometeorological and 5 tracer diffusion data sets were recommended for first archiving. The recommended data sets include: Micrometeorological - Minnesota 1973, Cabauw 1977-1979, Koorin Expedition, Cooperative Atmospheric Boundary Layer Experiment (CABLE), Penoix Project; Tracer Diffusion - Hanford 1964, Hanford Secondary Series, Cabauw, Karlsruhe 1969-1974, Ocean Breeze. Tabular summaries for these data are provided. From these data sets, the Minnesota 1973 and the Hanford 1964 were recommended for use in developing and testing the archive procedures and documentation.