Dahl, L. A. <br/><br/>
problem of proportioning portland cement raw mixtures / by -L. A. Dahl. 

 - Chicago : Portland Cement Association, Research Laboratories 
 - 27 p. 
 - Bulletin 17 / Portland Cement Association .
<br/><br/> Contenido: Part I: A general view of the problem. -- part I-I. Mathematical study of the problem. -- Part III. Applicat-ion to typical processes. -- Part IV. Direct control of pot-ential composition.