the 1967 Referendum which removed the discriminatory clause in the Australian Constitution which excluded Aboriginal Australians from being counted in the census – the referendum was one of the few to be overwhelmingly endorsed by the Australian electorate (over 90% voted "yes"). From the 1960s, Australian writers began to re-assess European assumptions about Aboriginal Australia – with works including Geoffrey Blainey's landmark history Triumph of the Nomads (1975) and the books of historian Henry Reynolds.From the late 1960s a movement for Aboriginal land rights developed, especially in South Australia under the Premiership of Don Dunstan. This era saw vast reformation in regards to land rights, anti-discrimination and personal rights. In the mid-1960s, one of the earliest Aboriginal graduates from the University of Sydney, Charles Perkins, helped organise freedom rides into parts of Australia to expose discrimination and inequality. In 1966, the Gurindji people of Wave Hill station (owned by the Vestey Group) commenced strike action led by Vincent Lingiari in a quest for equal pay and recognition of land rights. The Whitlam Labor and Fraser Liberal Governments instigated the Aboriginal Land Rights Act 1976, which, while limited to the Northern Territory, affirmed "inalienable" native title to some traditional lands. In 1985, the Hawke Government returned ownership of Uluru (formerly known as Ayers Rock) to the local Pitjantjatjara Aboriginal people. Indigenous Australians began to take up representation in Australian parliaments during the 1970s. In 1971 Neville Bonner of the Liberal Party was appointed by the Queensland Parliament to replace a retiring senator, becoming the first Aborigine in Federal Parliament. Bonner was returned as a Senator at the 1972 election and remained until 1983. Hyacinth Tungutalum of the Country Liberal Party in the Northern Territory and Eric Deeral of the National Party of Queensland, became the first Indigenous people elected to territory and state legislatures in 1974. In 1976, under the recommendation of Premier Don Dunstan, Sir Douglas Nicholls was appointed Governor of South Australia, becoming the first Aborigine to hold vice-regal office in Australia. Aden Ridgeway of the Australian Democrats served as a senator during the 1990s, but no Indigenous person was elected to the House of Representatives, until West Australian Liberal Ken Wyatt, in August 2010.In 1992, the High Court of Australia handed down its decision in the Mabo Case, recognising native title. That same year, Prime Minister Paul Keating said in his Redfern Park Speech that European settlers were