No. 87 (2010) M. Radovanac: ASTRONOMSKA OPSERVATORIJA U BEOGRADU OD 1956. DO 1975. GODINE ASTRONOMICAL OBSERVATORY OF BELGRADE FROM 1956 TO 1975 [PDF, 895KB] Although the present monograph "Astronomical Observatory of Belgrade from 1956 to 1975" is an independent work, it is in fact a continuation of the work done by the author and published in the series of the Publications of the Astronomical Society "Rudjer Boskovic" under the title "Astronomical Observatory of Belgrade from 1945 to 1955" in the Proceedings of the conference "Development of Astronomy among Serbs III", no. 6, pp. 55-200 in 2005; that manuscript in turn is an extension of the earlier paper (written together with Luka C. Popovic) and published in the series of the Publications of Astronomical Observatory of Belgrade "Development of Astronomy among Serbs II", no. 72, pp. 133-145 in 2002. Thus the three papers constitute a detailed review of the work of the Astronomical Observatory of Belgrade in the period of 35 years (of the total of 122 years) of its relatively recent history, from 1940 to 1975; this review is prepared using the archive material: general type of documents, notes of various meetings, especially the meet- ings of the Council of the Observatory, Scientific council and work plans, reports, correspondence, etc.