Ball, John <br/><br/>
Catalog of the Egan collection of silurian invertebrate fossils at the Chicago academy of sciences 

 - Chicago :  The Chicago academy of sciences,  1946 
 - 55 p 
 - Special publication, 7 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Faune invertébré<br/>Silurien
<br/><br/><label>Subjects--Index Terms: </label>Etats Unis