Geometry in 1968

Homology Theory: An Introduction to Algebraic Topology by Wylie, S., Hilton, P. J.

Totale Absolutkrümmung in Differentialgeometrie Und -Topologie by Ferus, Dirk

Flat Manifolds by Kamber, Franz, Tondeur, Philippe

Körper mit krummen Begrenzungsflächen by Haack, Wolfgang