Tjalsma, R. C. <br/><br/>
Stratigraphy and foraminifera of the neogene of the Eastern Guadalquivir Basin (Southern Spain) / 
R. C. Tjalsma 
 - Langbroek :  Schotanus and Jens,  1971 
 - 161 p. :  ill. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Cenozoic<br/>Foraminifera, Fossil<br/>Geology--Guadalquivir River watershed--Spain