TY  - BOOK
AU  - Ryan W S
AU  -  Brook P W
AU  -  Willis V A C
TI  - Increasing use of logical trees in the civil service
T2  - Civil service department
U1  - V3,8:(B2895)'N7, L0 
PY  - 1970///
CY  - London
PB  - Her Majesty's Stationery Office    
ER  -