Excerpted here is a film called "Monsters of the Past," documenting fieldwork by Carnegie Museum of Natural History paleontologists in 1922.

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The work -- which includes glimpses of scientists Earl Douglass, O.A. Peterson, Arthur Coggeshall and J. Leroy Kay -- was shot at Carnegie Quarry in Utah, which later became Dinosaur National Monument.

The quarry was the greatest Jurassic period dinosaur site ever discovered and provided the bulk of Carnegie Museum's world-class dinosaur fossil collection. It provided some 20 skeletons, including the museum's Camarasaurus, Allosaurus, Dryosaurus, Stegosaurus, Camptosaurus and Apatosaurus bones.

About 70,000 pounds of bones were shipped to Pittsburgh from the site.

The film also includes looks at the museum's dinosaur hall, which changed little from its opening in 1907 to its closing in 2005. It reopens this week after a $36 million expansion.

Questions or comments on this presentation may be sent here. This video was produced by Melissa Tkach.