187. Special provision regarding Scheduled Tribes
No transfer of land by a person who is a member of the Scheduled Tribes shall be valid unless—
(a)
the transfer is to another member of the Scheduled Tribes; or
(b)
where the transfer is to a person who is not a member of any such tribe, it is made with the previous permission in writing of the Collector; or
(c)
the transfer is by way of mortgage to a co-operative society.