TY  - BOOK
AU  - Rajiv, Rajendra Kumar
AU  - Avasthi, Rajendra (Ed)
AU  - Prabhakar, Vishnu (Ed)
TI  - Bal gyan-vigyan encyclopaedia: sanchar praivahan
U1  - 384.03 21st
PY  - 1992///
CY  - New Delhi
PB  - Pustakayan
KW  - Transportation; Encyclopaedias and dictionaries; Aeronautics, Commercial
ER  -