TY  - BOOK
AU  - Landgren, R.
AU  - Hanson, J. A., coaut.Pfeifer, D. W., coaut.
TI  - improved procedure for proportioning mixes of structural li-ghtweight concrete / by R. Landgren, J. A. Hanson, and D. -W. Pfeifer
CY  - Skokie, Illinois : atories
ER  -