Minutes of the meeting of numeric group in Lausanne on 20-21/11/1958. Relevant subjects: defining the work programme, nominating the president and the secretary
Summaries on the group activities, from 31/03/1959 to 19/10/1959
Invitation, agenda and minutes of the meeting of the numeric group in Milan on 05/03/1960. Relevant subjects: discussion on the results already obtained, forthcoming activities.
Invitation, agenda, note on stereocomparator and minutes of the meting of numeric group in Lausanne on 24/04/1961. Relevant subjects: analytical triangulation, method for the connection of adjacent strips, practical application of a stereocomparator, future activities of the working group
Invitation, agenda and minutes of the meeting of numeric group in Delft on 20-21/12/1963. Relevant subjects: activities report, future work programme

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