1. SLC to Janes Lampton Clemens, 24 August 1853

2. Technically, the same as 1. But .... "River Intelligence," 17 May 
1859, in the New Orleans Crescent

3. The Celebrated Jumping Frog of Calaveras County, and Other 
Sketches ("Curing a Cold")

4. SLC to Dorothy Quick, 2 and 3 October 1907 (the 3 October part of 
the letter)