The National Film Registry added 25 more classic American films of great variety for preservation in the Library of Congress, including “12 Angry Men,” “Back to the Future,” “The Man Who Shot Liberty Valance,” “Dances with Wolves” and “Oklahoma!.”

The National Film Registry, established in the late 1980s, aims to preserve up to twenty-five “culturally, historically, or aesthetically significant films” each year.

This year’s picks respect the essential conditions for admission: they are at least 10-years-old (three of them hail from the 1920s); they are of great variety (Westerns, sci-fi films, a musical, comedies etc).

The 25 chosen this year bring the registry total to 475.

“Even as Americans fill the movie theaters to see the latest releases, few are aware that up to half the films produced in this country before 1950 - and as much as 90 percent of those made before 1920 - are lost forever,” Librarian of Congress James H. Billington said as he announced this year’s selections.

“The National Film Registry seeks not only to honor these films, but to ensure that they are preserved for future generations to enjoy,” he said in a statement.

Among the films added this year to the National Film Registry are the 1955 Academy Award winning musical “Oklahoma!;” the 1977 sci-fi film about UFOs “Close Encounters of the Third Kind,” directed by Steven Spielberg and starring Richard Dreyfuss and François Truffaut – of eight Academy Award nominations, the film won Best Cinematography; and “12 Angry Men,” 1957, directed by Sidney Lumet and starring Paul Fonda.

“Dances with Wolves,” 1990, directed and produced by Kevin Costner, who also had a starring role as a cavalry officer during the Civil War, was also added. The film won seven Academy Awards, including in the Best Picture, Directing and Best Cinematography categories.

The 1985 sci-fi blockbuster “Back to the Future” was also inducted, as was “The Man Who Shot Liberty Valance,” considered to be director John Ford's last great Western, released in 1962.

Also being added to the registry:

- “Bullitt,” 1968;

- “Dance, Girl, Dance,” 1940;

- “Days of Heaven,” 1978;

- “Glimpse of the Garden,” 1957;

- “Grand Hotel,” 1932;

- “In a Lonely Place,” 1950;

- “The House I Live In,” 1945;

- “Mighty Like a Moose,” 1926;

- “Now, Voyager,” 1942;

- “Our Day,” 1938;

- “Peege,” 1972;

- “The Naked City,” 1948;

- “The Sex Life of the Polyp,” 1928;

- “The Strong Man,” 1926;

- “Three Little Pigs,” 1933;

- “Tol'able David,” 1921;

- “Tom, Tom the Piper's Son,” 1969-71;

- “The Women,” 1939,

- “Wuthering Heights,” 1939.