Willard, Bradford,  1894- <br/><br/>
Highway geology, Philadelphia to Pittsburgh, 
by Bradford Willard. 
 - Harrisburg, Pa.,  Department of internal affairs, Topographic and geologic survey,  1939. 
 - 2 p.l., 42 p.  illus., 2 maps (1 fold.) fold. tab.  23 cm. 
 - Bulletin G,  12 .
<br/><br/> At head of title: Pennsylvania Geological survey, Fourth series.  On cover: Commonwealth of Pennsylvania. Department of internal affairs. 
<br/><br/>"References":  p. 27-28. 
<br/><br/><label>LCCN: </label>gs 39000356  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>QE157  / .W53