I have many religious theology books from the 1960s  for free.  If you need a particular title send a PM with title and author.

Here are several...

The Son of Man, Francois Mauriac

Transformation in Christ, Dietrich von Hildebrand

The Epistle of Paul to the Romans, C. H. Dodd

The Meaning of Paul for Today, C. H.  Dodd

Health of Mind and Soul, Ignace Lepp

The Psychology of Loving, Ignace Lepp

Evangelical Theology, Karl Barth

The New Testament in Curren t Study, Reginald H. Fuller

The Future of Belief: Theism in a World Come of Age, Leslie Dewart

The Theology of St. Paul, D. E. H. Whiteley

Jesus Crist and Mythology, Rudolf Bultmann

Prayer in the Secular City, Douglas Rhymes

The Writings of Martin Buber, Edited by Will Herberg

Martin Buber: The Life of Dialogue, Maurice S. Friedman

honest To God, John A. T.  Robinson

The Christ of Faith, Karl Adam

teilhard de Chardin: On love and suffering, Paul Chauchard

Cosmos and History: The Myth of the Eternal Return, Mircea Eliade

Myth, Sacred History and Philosophy, Cornelius Loew

Translating Theology into the Modern Age, Edited by Robert W. Funk

Form Criticism, Rudolf Bultmann and Karl Kundsin

The Grave of God, Robert Adolfs

Revelation: A Protestant View, Roger Schutz and Max Thurian

The Son of God, Karl Adam

I and Thou, Martin Buber

Are You Running With Me Jesus, Prayers by Malcolm Boyd

Celibacy, E. Schillebeeckx, O.P.

The Dynamics of Faith, Paul Tillich

The Eternal Now, Paul Tillich

Objections to Roman Catholicism, Michael de la Bedoyere

Form Criticism, Rudolf Bultmann

Jesus Christ and Mythology, Rudolf Bultmann

God the Future of Man, E Schillebeeckx, O.P.

Christian Sacraments and Christian Personality, Bernard J. Cooke