Gradstein, S. Rob. <br/><br/>
Directory of bryologists and briological research /   
S. Rob Gradstein. 
 - Holanda :   Oosthoek,   1973. 
 - 67 p. ;   24 cm. 
 - Regnum Vegetabile ;   v.88 .
<br/><br/><label>Subjects--Index Terms: </label>Directorios Briologos