TY  - BOOK
AU  - Collins,Suzanne
TI  - Gregor and the marks of secret: Underland Chronicles, Book 4 
SN  - 978-0-439-79146-5
PY  - 2013///
CY  - New York
PB  - Scholastic
KW  - Imaginary wars and battles
KW  - Juvenile fiction
ER  -