JSTOR has 4 titles in this series.
Mark Twain
Livy Clemens
Susy Clemens
EDITED BY Benjamin Griffin
https://www.jstor.org/stable/10.1525/j.ctt7zw3s5
Edited by R. Kent Rasmussen
https://www.jstor.org/stable/10.1525/j.ctt2855rk
Edited with Introduction, Afterword, & Notes by Shelley Fisher Fishkin
Illustrations by Barry Moser
https://www.jstor.org/stable/10.1525/j.ctt1pnpss
Lin Salamo
Victor Fischer
Michael B. Frank
https://www.jstor.org/stable/10.1525/j.ctt1pnrbd