TY  - BOOK
AU  - Clayton,H.W.
AU  - Straker,D.N.
TI  - A natural approach to mathematics: part one 
AV  - QA135.5 C5.5
PY  - 1965///
CY  - Oxford [E.U.A.]
PB  - Pergamon
KW  - Matemáticas
ER  -