U.S. Geological Survey Open-File Report 2007-1194

Figure 3. Map of North America showing the locations where data in this database were collected. Data were collected as part of regional or long-term field studies. Most data were collected along the northeast coast of the United States and offshore of California.

Figure 3. Map of North America showing the locations where data in this database were collected. Data were collected as part of regional or long-term field studies. Most data were collected along the northeast coast of the United States and offshore of California.