TY  - BOOK
AU  - Boggs, Samuel Whittemore
TI  - International boundaries: a sutdy of boundary functions and problems 
AV  - JX 4111 B65
PY  - 1940///
CY  - New York
PB  - Columbia University
KW  - Fronteras
N1  - Bibliografía: p. 249-260
ER  -