By Resolution A1-35, the First ICAO Assembly held in May 1947 recommended that the Council adopt, as an ICAO Standard, as rapidly as practicable, for use in air-ground communications and relevant publications on international air navigation, the first ICAO Table of Units (based on Nautical Miles and Tens, Meters, Knots, Millibars, Degrees Centigrade, Kilograms and Metric Tons, 24-hours for the time, etc.). Recognizing the possibility that some States would find it impossible to employ these units in all cases, the Assembly further recommended that the Council should incorporate into the Standards suitable alternatives to be adopted by those States obliged to continue using the pound, foot or statute mile as basic units, in order to reduce the hazards resulting from the absence of uniformity.