The Catalog is a computer listing of federal agency monitoring activities derived from the 'Inventory of Federal Pesticide Monitoring Activities in Effect July 1973.' Instructions for completing the Inventory and the Inventory form are found in Appendix A. Residue data obtained from the monitoring activities listed in this catalog frequently appear in the Pesticides Monitoring Journal and other similar publications. The Monitoring Panel has defined monitoring as the repeated sampling and analysis of components of the environment to produce reliable estimates of the pesticide levels in the components and the change of these levels in time. Additional criteria for reporting a monitoring activity in this catalog are that examinations for residues be made by or on behalf of a federal agency, and that monitoring has been in effect since July 1, 1973.