"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country member" property.
Douglas Jerolmack, website username login: Sediment
Member of the following CSDMS groups
- Terrestrial Working Group
- Coastal Working Group
Signed up for the mailing list:
Rivers, deltas, coastlines and Arctic landscapes