TY  - BOOK
AU  -  Keyfitz,Nathan
AU  -  Beekman,John A.
TI  -  Demography through problems / 
SN  -  0387908366
U1  -  304.6 
PY  - 1984///
CY  -  New York : 
PB  -  Springer-Verlag, 
KW  -  Demography
KW  -  Problems, exercises, etc
N1  -  Includes bibliographical references and index
ER  -