Soveri, U. <br/><br/>
The Mineralogical Composition of Argillaceous Sediments of Finland 

 - Helsinki :   Suomalainen Tiedeakatemia,   1956. 
 - 32 p. :   figs. ;   18 cm. 
 - Annales Academiae Scientiarum Fennicae. Serie A. III. Geologica-Geographica ;   48 .