Juritsch, Geschichte der Babenberger and ihrer Lander (Innsbruck, 1894); M.
Hagen, " Die Gajo-Lander," Jahresb.
Drei Lander - Uri, Schwyz, u.
The Popo Agie and Lander fields produce the largest quantities of oil, the wells being partly gushers from which a heavy fuel oil is obtained.
There is a great variety in the grades of oils produced in the state, ranging from the heavy asphaltic oils of the Popo Agie and Lander fields to the high-grade lubricants and superior light products obtained from the wells in the Douglas, Salt Creek and Uinta county fields.