TY  - BOOK
AU  - C. V Durell
AU  -  A. W Siddons, 
TI  - Graph book : An exercise book and textbook
U1  - 511.5 
PY  - 1929///
CY  - Portugal
PB  - G. Bell & Sons Limited
N1  - C. V Durell & A. W Siddons: Graph book : An exercise book and textbook.  Portugal.  G. Bell & Sons Limited, 1929.--(511.5DUR)
ER  -