Notes
Hawksbill Station, a standalone novel by Robert Silverberg.

Also published as The Anvil of Time (Sidgwick & Jackson, 1969).

Previously published in a shorter form in Galaxy (August 1967).

Both versions of the story were published in Hawksbill Times Two (FoxAcre, 2002).

The image opposite and the blurb below are from the 1970 Universal-Tandem paperback edition, SBN 42604116X. Cover illustrator unknown.

Publisher's Blurb – Upper and Lower Covers
Banished from the complicated world of the far future to the barren emptiness of the remote past

1984 had come and gone, but still there were revolutionaries, dedicated to the overthrow of the Syndicalist Government. And like all totalitarian governments, that of 2006 needed a secure prison for its really dangerous opponents.

They found it, not in a remote area of the world, known or unknown, not in a distant galaxy a space-ship's voyage away, but beyond all limits known to man, a billion years in the past.

"Anyone who enjoys tales set in prehistory, as I do, should certainly look at this"
Brian Aldiss, Oxford Mail

"The author's story of men who move through the complicated worlds of the future and the empty worlds of the prehistoric past, further enhances his reputation as one of the elite among international science-fiction writers"
Eastern Times

Robert Silverberg is a winner of the coveted Hugo Award conferred by the World Science Fiction Convention. He is a past President of the Science Fiction Writers of America, and has written hundreds of science-fiction short stories and over twenty science-fiction novels.

Alternative Title
The Anvil of Time – 1969 Sidgwick & Jackson Hardback Edition, SBN 283980559. Cover illustrator unknown.