"sigurdson, jon . "
small scale cement plants: / jon.. sigurdson - 1 ed. - uk : intermediate technology 1977. - ", 28p.; 21 cm."
0 903031 46 9
553. 68 sig
small scale cement plants: / jon.. sigurdson - 1 ed. - uk : intermediate technology 1977. - ", 28p.; 21 cm."
0 903031 46 9
553. 68 sig