What is the title of the 1975 film in which a party of schoolgirls are on a day  out on St Valentine’s Day in 1900 where three girls and their teacher go missing?
Picnic at hanging rock Picnic at Hanging Rock Picnic at Hanging Rock (film)
picnic at hanging rock picnic at hanging rock film
picnic at hanging rock
WikipediaEntity
Picnic at Hanging Rock