Hyman, Vernon Tom. Seven days to Petrograd/ by Tom Hyman. - New York: Viking, 1989. - 357 p.: 19 cm. ISBN: 9780553297485 076783004504 LCCN: 2015657311 Subjects--Topical Terms: English literature Index Terms--Genre/Form: Adventure fiction.Fantasy fiction. LC Class. No.: PS3558.Y49