TY  - BOOK
AU  - Smith,M.R.
AU  - Collis,L.(Laurence).
TI  - Aggregates: sand, gravel and crushed rock aggregates for construction purposes 
SN  - 0903317893
PY  - 1993///
CY  - Bath : 
PB  - Geological Society, 
KW  - Aggregates (Building materials)
ER  -