Series of ten numbered journals for 1970. With the exception of the first, a large notepad, these are identical softback, ringbound excerise books. They have been used by Nicholson as journals (though he had inscribed some as 'Diary' on the cover) recording, in detail, his activities from early Feb to Dec 1970.

The entries cover conferences (foreign and UK) topics discussed with leading conservationists and colleagues, other conservation business such as the International Biological Programme, engagements and personal and family matters. He includes his thoughts, observations and opinions.

Significant conferences and foreign trips covered are given in the following descriptions.