By 1980 the infrequency of sightings of Mount Ararat, which looms about sixty kilometers across the Turkish border, became a symbol of worsening air pollution in Yerevan.

By 1686 he had definitely established the " Italian overture " form ( second edition of Dal male il bene ), and had abandoned the ground bass and the binary form air in two stanzas in favour of the ternary form or da capo type of air.

By the summer of 1944, victories in the Southwest and Central Pacific had brought the war closer to Japan, with American bombers able to strike at the Japanese main islands from air bases secured during the Mariana Islands campaign ( June — August 1944 ).

By the summer of 1944 the reversal of fortune was complete and Operation Bagration saw Soviet forces inflict crushing defeats on Germany through the aggressive use of armour, infantry and air power in combined strategic assault, known as deep operations.

By the time this air reaches El Salvador, it is dry, hot, and hazy.

By 1999, ESAF strength stood at less than 15, 000, including uniformed and non-uniformed personnel, consisting of personnel in the army, navy, and air force.

By varying the air pressure, a flute player can also change the pitch of a note by causing the air in the flute to resonate at a harmonic other than the fundamental frequency without opening or closing any holes.

By the time of Operation Overlord in June 1944, the Allies had gained near complete air superiority over the Western Front.

By 1943, the Allies began to gain the upper hand in the Pacific Campaign's air campaigns.

By mid-1944, Allied fighters had gained air superiority throughout the theater, which would not be contested again during the war.

By dragging down warmer air from the inversion layers, and preventing the ponding of colder air on the ground, the low-flying helicopters prevent damage to the fruit buds.

By increasing the concentration of oxygen in the air, the effects of lower barometric pressure are countered and the level of arterial pO < sub > 2 </ sub > is restored toward normal capacity.

By 1941, Germany had given up hope of evicting the Allies from the island and the constant air raids stopped.

By 1961, a British military mission had converted the constabulary into a combined a brigade of 2, 500 men which also established small air and naval forces in 1961.

By 1913 there were four planes, now including a British Sopwith and long term plans to create six naval air stations by 1918.

By putting backspin on the ball the Magnus effect results in air travelling over the top of the ball quickly and cleanly whilst air travelling under the ball is turbulent.

By implementing a refractive index correction such as this, an approximate realization of the metre can be implemented in air, for example, using the formulation of the metre as wavelengths of helium-neon laser light in vacuum, and converting the wavelengths in a vacuum to wavelengths in air.

By 1944 US and British air forces were sending huge air fleets over occupied Europe, increasing the pressure on the Luftwaffe day and night fighter forces.

By the end of August, relations improved again as the countries had redrawn the Hungarian and Romanian borders, settled some Bulgarian claims and Stalin was again convinced that Germany would face a long war in the west with Britain's improvement in its air battle with Germany and the execution of an agreement between the United States and Britain regarding destroyers and bases.

By this time, portions of Ormsby County had been given over to neighboring counties, reducing the county to Carson City and a few outlying settlements.

By the 6th century the majority of the modern county was part of the East Saxon kingdom.

By 1211 the Livonian province of Metsepole ( now Limbaži district ) and mixed Livonian-Latgallian inhabited county of Idumea ( now Straupe ) was converted to the Roman Catholic faith.

By Eastern Han times, the central government monopolies were repealed in favor of production by commandery and county administrations, as well as private businessmen.

By opening the ports of the county to all nations, and proclaiming full freedom of trade ( 1626 ), the commerce of the city was given great stimulus, the noble families taking part in its mercantile enterprises.

By the 1890s the county contained the following burghs, which were largely outside the county council's jurisdiction:

By 1793, four towns had been added to the county by division of the existing towns:

By the 1860s the towns of Harmony, Knightsville, and Brazil were growing rapidly, due in part to their location along the National Road, and also because of the many coal companies in that section of the county.

By 1951, enrollment stood at 35, 000 and included teachers, county and city employees.

By a treaty with Louis IX of France, he wrested the county of Barcelona from nominal French suzerainty and integrated it into his crown.

By 2030, the county is expected to have a population of about 360, 000.

By 2008 the county population had grown 43 % to 137, 589.

By votes in the commission, the commissioners are given executive responsibilities for the various county departments, which fall under the categories of " Roads and Transportation ", " Community Development ", " Environmental Services ", " Health and Human Services ", " Technlogy and Land Development ", and " Finance and General Services ".

By 1852, regular rail transportation from Columbia to Baltimore, Philadelphia, Pittsburgh, and Harrisburg made the town the commercial center for the area halfway between the county seats of Lancaster and York.

By contrast, in other municipalities, the sheriff's office may be merged with most or all city-level police departments within a county to form a consolidated city-county or metropolitan police force responsible for general law enforcement anywhere in the county.

By 1810, the county seat was at Denbigh.

By the time of the American Revolution, it was the most populous county in Virginia.

By 2005 non-Hispanic whites were 84. 5 % of the population of the county.

By the late 1950s, although immune from annexation by the bigger cities, the most recent suit by the city of Norfolk against Norfolk County would have taken all of the county land adjoining South Norfolk.

By the time most indentured workers had earned freedom and some rose to common planter status, the wealthiest planter families in the county already controlled the valuable riverfront.

By the late 1950s a majority of those graduating from high school in the county were Mexican American.

By January 1, 1991, almost of oil had been taken from county lands since 1936.

By 1920 only eighty-one people lived in the county, and only twenty-seven farms remained.