1872, John Hay, et al., Not Pretty, But Precious:
Nex' room my boy lies in the shadder an' dark.
1876, Mark Twain (Samuel Clemens), The Adventures of Tom Sawyer, Complete:
We spotted the shadder to a dot."
1904, Marietta Holley, Samantha at the St. Louis Exposition:
And I see with joy that the shadder on my pardner's face lifted quite a little durin' our stay there, but of course this belated us and we didn't git to St. Louis till Saturday late in the afternoon.
1906, Henry Wallace Phillips, Mr. Scraggs:
And yet that Chink had the innocentest face in Utah; he might ha' stood for a picture of Adam before Eve cast a shadder on his manly brow.
1916, Francis Lynde, The Taming of Red Butte Western:
"If I didn't know better, I'd swear that was Hallock again--or Hallock's shadder follerin' him at a good long range!"
1966, Ambrose Bierce, The Collected Works of Ambrose Bierce, Volume 8:
But ole Sim Salper is never a-goin' to fret hisself to a shadder about it.