"Lost" Speeches and Agrapha

[Herndon]

Hello everyone!

Some years ago I came across a quote by Lincoln on Providence ("the providence of the most men, the largest purse, and the longest cannon"). It wasn't until recently, when talking to someone much more familiar with Abe than myself (who was initially sure that this wasn't from any of his speeches, as he had read all of them and hadn't come across this), that I found this was from a speech he gave in 1856 which was only partially recorded (by William Herndon).

This leads me to wonder: how many more of these partially-recorded speeches are there? Are there definitive collections of Lincoln's speeches, and if so, do any of these contain any fragmentary ones, or references to speeches that weren't written down at all? Are there any other quotes or such like which are also not recorded in definitive sources, much like the way the "Agrapha" relates to the NT?

I've tried to find other examples, but without a working familiarity with any but his best-known speeches I haven't been able to make any progress. Any other stories of lesser-known "words of Lincoln" would also be very interesting!