TY  - BOOK
TI  - Understanding our universe
SN  - 9780393936315
AV  - QB43.3 UND 2015
PY  - 2015///
CY  - New York : 
PB  - W.W. Norton & Company, Inc., 
KW  -  Astronomy
KW  - Textbooks
N1  - includes index
ER  -