A history professor fighting to access the so-called "palace letters" over the 1975 Whitlam dismissal says it's time - for "quasi-colonial control over our historical knowledge to end".
Monash University's Jenny Hocking has lodged an appeal to the full bench of the Federal Court against a March decision that the letters, between the Queen and the then governor-general, are personal communications rather than official commonwealth records.
The Federal Court in mid-March ruled the letters, held by the National Archives of Australia, didn't have to be released as they were the personal property of then governor-general John Kerr.
The case involves access to Sir John's communications with the Queen in his capacity as governor-general. Prof Hocking believes there could be 40 to 60 letters regarding the Whitlam dismissal.
In 1975 the governor-general dismissed Labor prime minister Gough Whitlam and his government from office at the height of a constitutional crisis after the Senate blocked supply.
Prof Hocking says it's time for the "obscure quasi-colonial control over our historical knowledge to end".
"The fact they're embargoed by the Queen is something I find particularly concerning," she told AAP on Tuesday.
"It was a very polarised period in our history and so it's quite important that we know and understand what version of that history the governor-general was passing on to the Queen.
"There's (also) a genuine issue to be resolved regarding the use of the term 'personal records'."