It is a mine of information to those who want to study the many subjects a director is supposed to understand.
It is quite a mine of information about what is happening, and the difficulties of extending it under present conditions.
It is a mine of information which we may be able to use in our discussions on the subject.
They are a mine of information for any historian.
The report is a mine of information if nothing else.
It is a mine of information on these subjects.
They did a tremendous lot of detailed, hard work which has been a mine of information to me.
It is a mine of information of every kind.
