Armstrong, Augustus K.  1930 <br/><br/>
Pennsylvanian carbonates, paleoecology, and rugose colonial corals, north flank, eastern brooks range, Arctic Alaska / 
by Augustus K. Armstrong. 
 -- Washington :   United States Government Printing Office,   1972 
 - 19 p., [8] h. de lam. -- 
 (Geological Survey Professional Paper  ; 747).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Corales fósiles<br/>Pennsylvania
<br/><br/><label>Universal Decimal Class. No.: </label>563.6(748)