Hartley, W. Douglas <br/><br/>
Otto Ping: Photographer of Brown County, Indiana 1900-1940 

 - Indianapolis, IN  Indiana Historical Society  1994 
<br/><br/><label>ISBN: </label>0-87195-105-3 
<br/><br/><label>Subjects--Personal Names: </label><br/>Ping Family
<br/><br/><label>Subjects--Topical Terms: </label><br/>Families<br/>Photographs<br/>History
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Indiana -- Brown County