TY  - BOOK
AU  - Kilford, W. K.
TI  - Elementary Air Survey 
SN  - 0273010824
U1  - 526.9823 
PY  - 1980///
CY  - London : 
PB  - ELBS/Pitman, 
KW  - Air Survey
N1  - YY
UR  - https://eaklibrary.neduet.edu.pk:8443/catalog/bk/books/toc/0-273-01082-4.pdf
ER  -