"7.19 Canyon de Chelly National Monument.
(a) Visitors are prohibited from entering the canyons
of Canyon de Chelly National Monument unless accompanied by National
Park Service employees or by authorized guides: Provided,
however, That the Superintendent may designate, by marking on a map
which shall be available for public inspection in the Office of the
Superintendent and at other convenient locations within the monument,
canyons or portions thereof which may be visited or entered without
being so accompanied.
(b) The Superintendent may issue permits to properly
qualified persons to act as guides for the purpose of accompanying
visitors within the canyons.
[32 F.R. 13129, Sept. 15, 1967]"