81. Presumption as to Gazettes, newspapers, private Acts of Parliament and other documents.- The Court shall presume the genuineness of every document purporting to be the London Gazette or 1[ any Official Gazette, or the Government Gazette] of any colony, dependency or possession of the British Crown, or to be a newspaper or journal, or to be a copy of a private Act of Parliament 2[ of the United Kingdom] printed by the Queen' s Printer and of every document purporting to be a document directed by any law to be kept by any person, if such document is kept substantially in the form required by law and is produced from proper custody.