TY  - GEN
AU  - Usill, G.W.M.
AU  - Hart, K.M. 
AU  - Hart, M.P.M. 
TI  - Usill's practical surveying : a text book for students
SN  - 0291394183
PY  - 1973///
CY  - London
PB  - Technical Press
KW  - SURVEYING
ER  -