TY  - BOOK
AU  - Crepas, Robert Allen,
TI  - Pumping concrete: Techniques and applications 
SN  - 0924659475
AV  - TJ900 A55 1991
PY  - 1991///
CY  - Addison, illinois
PB  - Aberdeen group
KW  - Maquinaria de bombeo
ER  -