AACR, or the Anglo-American Cataloguing Rules, was first published in 1967 in separate editions for Britain and North America. The 1967 edition had as its basis the Paris Principles developed at a conference in 1961. It took until 1978 for AACR2 to be published as a single edition, and soon after, the standard began to be adopted by Australian libraries - the National library of Australia adopted AACR2 in 1981.