I could not find much information.
You might want to try the Adams County Historical Society
http://www.achs-pa.orgI did find an advertisement in a historical newspaper, Gettysburg Times, about 1909, for: "Col. E. Spangler, successor to Alex Spangler, Wholesale and Retail Dealer in Grain, Salt, Flour, Hay, and Coal."
A little earlier than the 1900's, I found an 1880 city directory entry for William and John Slifer - coal dealers, Littlestown, PA.