Aruanne Geoloogilise Komitee tegevusest : 18.VIII 37 - 01.IV 39 = Report of the activities of the Geoloogiline Komitee (Geological Survey of Estonia) for the period 18.VIII 37-1.IV 39
Summary: Report of the activities of the Geoloogiline Komitee (Geological Survey of Estonia) for the period August 18-th 1937 - April 1-st 1939, p. 15-16