Mars produced by the U.S.S.R. As soon as the task group accepts a name it is considered to be "proposed" and can be used on published maps. Approved names are those passed by I.A.U. General Assemblies. At its organizational meeting in Brussels, Belgium, in 1919, the IAU formed a nomenclature committee of international composition to sort out and regularize the several competing systems of lunar nomenclature. In 1935, Blagg and Muller's "Named Lunar Formations" became the first systematic

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... of lunar nomenclature. Later, the "System of Lunar Craters, quadrants 1, 2, 3, 4" by D.W.G. Arthur and others, under the direction of Gerard P. Kuiper, listed names in an expanded lunar nomenclature. In 1958, an IAU nomenclature group, chaired by Audouin Dollfus, adopted 128 names for albedo (bright, dark, or colored) features for Mars. After the successful Mariner flyby missions to Mars during the 1960's, and in anticipation of the Mariner 9 mission, a Mars nomenclature group chaired by Gerard de Vaucouleurs was formed in 1970 to designate names of Martian topographic features shown in the new spacecraft images. Donald H. Menzel chaired a lunar group that, from 1968 until 1973, suggested names for features discriminated by the Zond, Lunar Orbiter, and Apollo cameras. At the Sydney, Australia, meeting of the IAU in 1973, the nomenclature group was enlarged and reconstituted as the Working Group for Planetary System Nomenclature (WGPSN, or Working Group); the group was chaired by Peter Millman (Canada) and reported to the IAU Executive Committee. Task groups were formed for the Moon, Mars, Mercury, Venus, and Outer Planets at that time. In 1983 at Patras, Greece, Harold Masursky (U.S.A.) became president of the WGPSN and several new members were added. At the Tbilisi, USSR meeting in 1984, Working Group members agreed to form a new Task Group to name surface features on small primitive bodies (asteroids and comets). This task group was formed at the General Assembly held in New Delhi in 1985. in The present members of the Working Group and Task Groups are as follows Working Group for Planetary System Nomenclature