25 U.S.C. § 275 : US Code - Section 275: Leaves of absence to employees

Search 25 U.S.C. § 275 : US Code - Section 275: Leaves of absence to employees

On and after August 24, 1912 teachers in schools operated by the
Bureau of Indian Affairs may be allowed, in addition to annual
leave, educational leave not to exceed thirty workdays per calendar
year, or sixty workdays in every alternate year, for attendance at
educational gatherings, conventions, institutions, or training
schools, if the interest of the Government requires, under such
regulations as the Secretary of the Interior may prescribe; and no
additional salary or expense on account of such leave of absence
shall be incurred.