The Letters of Robert Frost, Volume 1: 1886–1920 Robert Frost, Donald Sheehy, Mark Richardson, Robert Faggen
The Letters of Robert Frost, Volume 3: 1929–1936 Robert Frost, Mark Richardson, Donald Sheehy, Robert Bernard Hass, Henry Atmore
The Letters of Robert Frost, Volume 2: 1920–1928 Robert Frost, Donald Sheehy, Mark Richardson, Robert Bernard Hass, Henry Atmore