Table 35.-Shellfish bed closures, by region, 1966-1990.

Source: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey, Ocean Assessments Division, Strategic Assessment Branch, Trends in Harvest-Limited Shellfish Areas (Rockville, MD: Data compiled from the National Estuarine Inventory database).

Related Tables: 5, 6, 31, 32, 65, 97.

Table 36.-Sea level trends for selected coastal areas in the United
States, 1930-1980.

Source: Douglas, B.C., Global sea level rise, Journal of Geophysical Research, 96(C4): 69816992, (April 1991).

*Corrected for postglacial rebound.

Related Tables: 38, 44.

Air Quality

Figure 15a.-U.S. emissions of particulates, by source, 1970-1991.

Figure 15b.-U.S. emissions of sulfur oxides, by source, 1970-1991.

Figure 15c.-U.S. emissions of nitrogen oxides, by source, 1970-1991.

Figure 15d.-U.S. emissions of volatile organic compounds, by source, 1970-1991.

Figure 15e.-U.S. emissions of carbon monoxide, by source, 1970-1991.

Figure 15f.-U.S. emissions of lead, by source, 1970-1991.