(a) Original surveys. Application for the original extension of the rectangular system of public land surveys to include unsurveyed townships should be filed in duplicate with the State Director for the State in which the lands are situated. The application may be in letter form, and should describe the unsurveyed area by township and range of the public surveys, and should set forth the interest of the applicant in the land and the basis of need for extension of the surveys.

(b) Lands omitted from original survey. Application for the survey of an unsurveyed island or other land omitted from the original survey shall be made on Form 9600-2, or its equivalent, and filed in duplicate with the State director for the State in which lands are situated.