Are There Historical Records About The Traditional Use Of Emu Oil?

In short, yes! Here are some sources with historical documentation of traditional use of emu oil by Aborigines:

Beveridge P (1884) Of the Aborigines inhabiting the Great Lacustrine and Riverine Depression of the Lower Murray, Lower Murrumbidgee, Lower Lachlan, and Lower Darling. Journal and Proceedings of the Royal Society of New South Wales 17: 19– 74
Elkin A P (1977) Aboriginal Men of High Degree. Brisbane: University of Queensland Press

Gason S (1879) The “Dieyerie”. In G Taplin (ed) Tribe Folklore, Manners, Customs, and Languages of the South Australian Aborigines (pp 66– 86). Adelaide: South Australia Government Printer

Hardy B (1969) West of the Darling. Brisbane: Jacaranda Press

Howitt A W (1904) Native Tribes of South-East Australia. London: Macmillan