Appalachian Tectonics Studies Group (ATSG) The Appalachian Tectonic Studies Group (ATSG) is an informal group of earth scientists interested in the tectonics of the North American Appalachian Mountains.
(The Appalachian Tectonic Studies Group; is; an informal group of earth scientists interested in the tectonics of the North American Appalachian Mountains)
The Appalachian Tectonic Studies Group
is
an informal group of earth scientists interested in the tectonics of the North American Appalachian Mountains