Quaternary stratigraphic, hydrologic, and climatic history of the Great Basin, with emphasis on Lakes Lahontan, Bonneville, and Tecopa - Morrison, cited in the first ref, said the area of the GB "exceeds 500,000 square kilometers" ; this source is not available online, is part of DNAG - this volume.
The Great Basin: A Natural Prehistory - Grayson, at Amazon. (and here's a Google Book preview.) A better map of the GB. Grayson discounts having the Salton Sea in the Great Basin on page 11. His map, page 12, also ends the Great Basin in Pahranagat Lake, as justified below (Witt etal, 2008):
Jonathan D.S. Witt, Doug L. Threloff, and Paul D.N. Hebert -
Genetic zoogeography of the Hyalella azteca species complex in the Great Basin: Rapid rates of molecular diversification in desert springs:
Geological Society of America Special Papers, 2008, 439, p. 103-114, doi:10.1130/2008.2439(05). Page 104 (clip from Google Books):
Late Cenozoic Drainage History of the Southwestern Great Basin and Lower Colorado River Region: Geologic and Biotic Perspectives -
edited by Marith C. Reheis, Robert Hershler and David M. Miller).
Fishes of the Great Basin - a Google Books preview - shows the White River above the lower end of Pahranagat Valley as in Great Basin.
|Google Earth image of the West with a lot of lines. The Great Basin divide according to me is in magenta, wrapping around the Great Basin. Note the two possibilities at Pahranagat Lake, and no Salton Sea.|
The Jarbidge Mining District, 1923 - mentions the GBD.