The Smithsonian Institution's National Museum of American Art is beginning an inventory of American sculpture in an effort to document significant American art.

The project marks the first survey of the nation's monuments, statues and memorials across the United States, as well as sculptures in museums, historical societies, corporate and private collections, all created by American artists or by those whose works are identified with the United States.Information will be stored by computer and will eventually provide the only substantial repository of information on American sculpture.

Individuals and institutions may contribute information to the inventory by writing: Office of Research Support, National Museum of American Art, Smithsonian Institution, Washington, DC 20560.

NEW YORK (AP) - "Boccioni: A Retrospective," the first exhibition in the United States to survey the career and achievement of the 20th century Italian artist Umberto Boccioni, is being shown at the Metropolitan Museum of Art through Jan. 8, 1989.

Boccioni (1882-1916) is chiefly known as the leading exponent of Futurism in Italy. The more than 150 works in the show include paintings, sculptures, drawings and prints.