[Above: This is from a German nudism book called Mensch und Sonne.]

[Above: This is from a German nudism book called 'Geist und Schönheit' (Spirit and Beauty), 1940.]

[Above: Stereoview, circa 1939.]

[Above: Alfred Grabner 'Dans les Plaines du Danube', 1933.]

[Above: This is from the book Spirit and Beauty.]

[Above: This is from 'Beauty of the Body'. Circa 1938.]

[Above: This is from 'Beauty of the Body'. Circa 1938.]

[Above: This is from 'Beauty of the Body'. Circa 1938.]

[Above: This is from 'Beauty of the Body'. Circa 1938.]

[Above: This is from 'Beauty of the Body'. Circa 1938.]

[Above: This is called 'Spring in the Sun'.]

  • Below are an example of some relevant publications.