Section 3 in The Official Languages (Use For Official Purposes Of The Union) Rules, 1976
3. Communications to States, etc., other than to Central Government offices .-(1) Communications from a Central Government office to a State or a Union territory in Region `A' or to any office (not being a Central Government office) or person in such State or Union territory shall, save in exceptional cases, be in Hindi, and if any communication is issued to any of them in English it shall be accompanied by a Hindi translation thereof.
(2)Communications from a Central Government office:--(a)to a State or Union territory in Region `B' or to any office (not being a Central Government office) in such State or Union territory shall ordinarily be in Hindi and if any communication is issued to any of them in English, it shall be accompanied by a Hindi translation thereof:Provided that if any such State or Union territory desires the communications of any particular class or category or those intended for any of its offices, to be sent for a period specified by the Government of the State or Union territory concerned, in English, or in Hindi with a translation in the other language, such communication shall be sent in that manner;(b)to any person in a State or Union territory of Region `B' may be either in Hindi or English.(3)Communications from a Central Government office to a State or Union territory in Region `C' or to any office (not being a Central Government office) or person in such State shall be in English.(4)Notwithstanding anything contained in sub-rules (1) and (2), communications from a Central Government office in Region "C", to a State or Union territory of Region "A" or Region "B" or to any office (not being a Central Government office) or person in such State may be either in Hindi or in English:Provided that communications in Hindi shall be in such proportion as the Central Government may, having regard to the number of persons having working knowledge of Hindi in such offices, the facilities for sending communications in Hindi and matters incidental thereto determine from time to time.
