Collected Works of Abraham Lincoln. Volume 2.
Lincoln, Abraham, 1809-1865.


[1]   DS, DNA IR RG 241, Records of the Patent Office, Patented File, No. 6469. Only Lincoln's signatures are in his hand. The drawing is now missing from the file, but is reproduced from Nicolay and Hay, Abraham Lincoln: A History.

[2]   Edmund Burke was Commissioner of Patents.