Hill, Robert Thomas,  1858-1941. <br/><br/>
The lower Cretaceous Gryphæas of the Texas region, 
by Robert Thomas Hill and Thomas Wayland Vaughan. 
 - Washington,  Govt. Print. Off.,  1898. 
 - 139, ix p.  xxxv pl., diagrs.  24 cm. 
<br/><br/><label>LCCN: </label>gs 05000712  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gryphæa.<br/>Paleontology--Texas.<br/>Paleontology--Cretaceous.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 151