was suspended and reverted, in title, to the Survey Section, RAE (Permanent). Mapping continued, mainly the 'one-mile' maps, albeit at a reduced rate consistent with the allocated resources, with priority given to areas around Brisbane, Sydney and Melbourne. By 1929 the Section had produced fifty-four 'one-mile' maps including five revised maps. Technical developments provided for improved efficiencies. These included use of single photographs and strips of air photographs to supplement ground surveys by plane-table for topographic detail. The first military map produced with a significant component of aerial photography flown by the Royal Australian Air Force was the Albury 'one-mile' map published in 1933. Compilation of this map highlighted inconsistencies in State triangulation systems and once again demonstrated the need for a national geodetic survey which had been identified by colonial survey officers in the 1890s. The Survey Corps undertook this field and computation work linking QLD, NSW, VIC and SA with a 1st Order trigonometric network by 1939. In 1932, the Army decided that the Order in Council which created the Corps in 1915 had never been broken and so the title of the military survey unit was once again the Australian Survey Corps (Permanent Forces) with the personnel establishment of fourteen all ranks as it had been for twelve years. Recruiting recommenced and in 1935 the Corps establishment was raised to twenty-five all ranks. Increments allowed for a Survey (Topographic) Section to be based in each of three states, New South Wales, Victoria and Queensland, a Survey (Geodetic) Section and the Survey (Draughting) Section in Melbourne. Then in 1938, with war clouds once again on the horizon, a three-year Long Range Mapping Programme was approved, with additional funding bringing the total to ninety-seven all ranks. These extra resources would provide for a total of about thirty-five new '1 mile' maps each year. However, at the outbreak of the Second World War there were only fifty members in the Australian Survey Corps. Most of the men were professionally qualified, and the Corps was very knowledgeable of emerging technical developments which would improve efficiencies in map production. That there were no militia units of the Corps was due mainly to the fact that little progress in the mapping programme was achieved with part-time effort. The Corps was well equipped for the range of field survey and office mapping tasks with the exception of printing presses. Maps were printed by the