TY  - GEN
ED  - Reading And Thinking In English
TI  - Concepts in use
SN  - 0-19-451351-3
U1  - 420 / R312c 
PY  - 1982///
CY  - Mexico
PB  - Harla
KW  - Ingles-enseñanza
N1  - Systems, cap.1  state of systems, cap.2  structures 1, cap.3  structures 2, cap.4  systems in action 1, cap.5  systems in action 2, cap.6  processes, cap.7  interactions, cap.8  evolution of systems, cap.9  final review, cap.10
ER  -