TY  - SER
AU  - Berg, R.J.
TI  - A.I.D. research & development abstracts ; 
T2  - A.I.D. research & development abstracts ; 
PY  - 1981///
CY  - Washington-US : 
PB  - United States Agency for International Development, 
N1  - Art¡culo dentro de: Transportation; Sumarios de investigación
ER  -