Draft agenda and minutes of the 39th meeting of the Steering Committee in Vienna from 28 to 29/04/1971. Related subjects: activities of the Commissions, extension of OEEPE activities to new research subjects, participation to the SIP III Commission symposium, adhesion of Swiss group. Annexes: report on Oberschwaben programme by Commission A/B, brief report on the test "independent couples", report on activities of Commission C for the period 10/1970-04/1971, technical note/opinion by Meier, report by the German delegation.
Draft agenda and minutes of the 40th meeting of the Steering Committee (Brussels, 20–21/10/1971). Annexes: proposal for an APR research programme of Commission AB, conference paper by Ackermann on Oberschwaben aerial triangulation experiments, reports on activities of Commission A/B, C, D, report by the German delegation

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