TY  - BOOK
AU  - Lawson,R.I.
AU  - Hawkes,J.R.
AU  - Dangerfield,J.
ED  - Her Majesty΄s Stationery Office
TI  - A system for the computer storage and retrieval of petrographical and related data
T2  - Institute of Geological Sciences : Natural Environment Research Council. 75/5
SN  - 0118807250
U1  - 621.39021 
PY  - 1976///.
CY  - London: 
PB  - Her Majesty's Stationery Office, 
KW  - Petrography
N1  - Includes bibliographical references (p. 6-7)
ER  -