In 2019 Westminster Theological Seminary produced a now hard to obtain (except in e-form)
legacy edition of Machen's
Christianity and Liberalism with a number of interesting extras. Machen founded the seminary in 1929. There is a Foreword by Peter A. Lillback and an Introduction by David B. Garner. There are also a number of essays by the Faculty of Westminster Theological Seminary, as follows:
“Machen and History” by Chad Van Dixhoorn
“J. Gresham Machen, Fundamentalism, and Westminster Seminary” by Peter A. Lillback
“Machen and Apologetics” by William Edgar
“Machen and Philosophy” by K. Scott Oliphint
“Christianity and Liberalism and Preaching” by John Currie
“Christianity and Liberalism and the Church” by Alfred Poirier
“The Value of Christianity and Liberalism to World Missions” by R. Kent Hughes
“Machen and Scholarship” by Sandy Finlayson
“Machen and Liberalism” by R. Carlton Wynne
“Machen on the True Christian Religion” by Lane G. Tipton
“Salvation’s Center: The Sufferings of Christ and the Glories that Follow” by Iain Duguid
“The Historicity of Adam: A Gospel Presupposition” by Jonathan Gibson
“Christianity and Liberalism and the Old Testament as History” by Elizabeth W. D. Groves
“Christianity and Liberalism and Biblical Prophecy” by Stephen M. Coleman
“Machen and Christ’s View of the Old Testament” by G.K. Beale
“Christianity and Liberalism and the Gospels” by Brandon D. Crowe
“Christianity and Liberalism and Hermeneutical Presuppositions” by Vern S. Poythress
I have now managed to get hold of a paperback copy of the work and have enjoyed reading the brief essays.