Black and white negative print of map of Europe drawn by Dr. Becker, showing migration from Middle East, along North African coast, into Iberia and onto Ireland and Scotland.

Black and white negative print of map of Europe drawn by Dr. Becker, showing migration from Middle East, along North African coast, into Iberia and onto Ireland and Scotland.

Black and white negative print of map of Atlantic drawn by Dr. Becker, showing Viking routes along the North Atlantic.

Black and white negative print of map of Europe drawn by Dr. Becker, showing major language groups and their heartlands, mainly in eastern Europe.

Black and white negative print of map of Europe drawn by Dr. Becker, showing navigable rivers.

Colour positive prints of Atlantic waves crashing onto the Aran coast, colour has faded on slides.

Colour positive prints of Atlantic waves crashing onto the Aran coast, colour has faded on slides.

Colour positive prints of Atlantic waves crashing onto the Aran coast, colour has faded on slides.

Colour positive prints of Atlantic waves crashing onto the Aran coast, colour has faded on slides.

Colour positive prints of Atlantic waves crashing onto the Aran coast, colour has faded on slides.