TY  - BOOK
AU  - Neal,Robert E.
ED  - American Concrete Institute
TI  - Instructor manual: ACI certification program for concrete laboratory testing technicion grade I and grade II 
T2  - Publication CP-18 (90)
AV  - TH1461 I57
PY  - 1990///]
CY  - Detroit, Michigan
PB  - ACI
KW  - Construcciones de concreto
ER  -