Very nice group of the first five volumes in The Doorway Paper Series by Arthur C. Custance. 

Arthur C. Custance (1910 – 1985) was a British born Canadian who wrote about the unique connections between scientific research and biblical understanding bringing together faith and reason. His works were very influential in the movement to synthesize Scripture and Science. 

There is an extensive biography of him available HERE. 

Custance, Arthur C. Volume I: The Doorway Papers: Noah's Three Sons Human History in Three Dimensions. Grand Rapids. Zondervan Publishing House. 1976. 368pp.

Custance, Arthur C. Volume II: The Doorway Papers: Genesis and Early Man. Drawings by the Author. Grand Rapids. Zondervan Publishing House. 1976. 331pp.

Custance, Arthur C. Volume III: The Doorway Papers: Man in Adam and Christ. Grand Rapids. Zondervan Publishing House. 1976. 350pp.

Custance, Arthur C. Volume IV: The Doorway Papers: Evolution or Creation? Grand Rapids. Zondervan Publishing House. Drawings by the Author. 1976. 329pp.

Custance, Arthur C. Volume V: The Doorway Papers: The Virgin Birth and the Incarnation. Grand Rapids. Zondervan Publishing House. 1976. 400pp.

A good + set, bound in cloth, generally solid, with moderate foxing to the foredges, and moderate ink marks.