TY  - BOOK
AU  - Hartwell,David G
AU  - Cramer,Katharyn
TI  - The ascent of wonder: : the evolution of hard SF
SN  - 0-312 -85062
AV  - PS374.S35A77 
PY  - 1994///
CY  - New York
PB  - : Tom Doherty Association Inc
KW  - Science fiction
KW  - Literature and Science
ER  -