Dahl, T., Johnson, C. 1991. Wetlands Status and Trends in the Conterminous United States, Mid-1970s to Mid-1980s. United States Fish and Wildlife Service, Washington, DC.

Assessment, wetlands

https://www.fws.gov/wetlands/Documents/Wetlands-Status-and-Trends-in-the-Conterminous-United-States-Mid-1970s-to-Mid-1980s.pdf

This primary goal of this report was to estimate the wetland acreage of the United States in both the mid-1970’s and the mid-1980’s. This report constitutes a statistically valid effort to estimate the wetland resources of the United States; additionally, it provides indications of gains or losses for 14 categories of wetland and deepwater habitats.