Recently I've acquired a 1968 Woden Valley, Deakin & Yarralumla Bus Timetable, through an Australian Timetable Association auction (I have a copy already but it is glued strongly to the back of the Northern & Southern suburbs timetable I already, I've tried removing but I didn't want to damage it. But now I have both separated from acquiring both from above said auction). Inside one of the timetables was these letters from the Canberra Times.
(https://c2.staticflickr.com/2/1698/24462490669_9ec266d45d_b.jpg)
I've seen a few letters like that when browsing through Trove. If you didn't know when they were written, you could believe they were modern.