Includes 'Declaration Ecoropa', a 6pp typescript draft on the need for a different European identity, an ecological democracy. [?1979]. With ms. additions and corrections by Tinbergen.

Two letters from the American Psychological Association regarding Tinbergen being selected as one of the recipients of the Distinguished Scientific Contribution Award.

Drawings of fellow hostages interned by the Nazis during the Second World War. The subjects are usually identified and the drawings dated and signed by Tinbergen.

Drawings of fellow hostages interned by the Nazis during the Second World War. The subjects are usually identified and the drawings dated and signed by Tinbergen.

Card signed by Tinbergen and his fellow hostages, 8 February 1944. Hand-drawn menu 'ter gelegenheid van de 27ste verjaardag van Nico Tinbergen' signed by Tinbergen and his fellow hostages, 15 April 1944.

Drawings by J.J. Ter Pelkwijk, a student of Tinbergen's who was killed during the Second World War. The drawings are accompanied by a note by E.A. Tinbergen which identifies the artist.

Dutch ms. text and drawings for Tinbergen's children's story about Kliew, the seagull, written from a German internment camp.

Dutch ms. text and drawings for Tinbergen's children's story about Kliew, the seagull, written from a German internment camp'

Dutch ms. text and drawings for Tinbergen's children's story about Kliew, the seagull, written from a German internment camp.

Dutch ms. text and drawings for Tinbergen's children's story about Kliew, the seagull, written from a German internment camp.

Tinbergen explained how the story came to be written: 'While in the hostage camp for two years, I was allowed to write a letter to my family each week. One page in each letter I made into a picture story for my children, in order to keep up some sort of communication with them. In this way Kleew was made'. The book was published as Kleew in English, as Kliew in Dutch.

Postcard used for a drawing of the Hulshorst camp with signatures on verso. Hulshorst had been the location for the fieldwork of Tinbergen and his students for many years and 1949 was the year he moved to Oxford.

Drawings for Tinbergen's children's story The tale of John Stickle published by Methuen, 1954.

Drawings for Tinbergen's children's story The tale of John Stickle published by Methuen, 1954.

Drawings by Tinbergen, mainly anatomical.

Drawings by Tinbergen, mainly anatomical.