By 1971, 12 percent of the total area of South Vietnam had been sprayed with defoliating chemicals, at an average concentration of 13 times the recommended USDA application rate for domestic use.

By 1971, 12 percent of the total area of South Vietnam had been sprayed with defoliating chemicals, at an average concentration of 13 times the recommended USDA application rate for domestic use.

By the end of 1971, 29 barricades were in place to prevent access to what was known as Free Derry, 16 of them impassable even to the British Army's one-ton armoured vehicles.

By 1971, when a bibliography of ab initio calculations was published, the largest molecules included were naphthalene and azulene.

By 1971, Bell researchers Michael F. Tompsett et al.

By 1971 ELF activity had become enough of a threat that the emperor had declared martial law in Eritrea.

By 1971, the show's ratings had plummeted.

By the mid-1960s, the East Pakistan was accounting for less than 60 % of the nation's export earnings, and by the time of Bangladesh's independence in 1971, this percentage had dipped below 50 %.

By 1971, Friedman had formed his second band, Kinky Friedman and The Texas Jewboys, which many took to be a play on the name of the famous band Bob Wills and His Texas Playboys.

By the 1971 – 72 season, Dalglish had become established in the Celtic first team.

By 1971, this amounted to more than $ 1 billion.

By 1971, Malmö reached 265, 000 inhabitants, but this was the peak which would stand for more than 30 years.

By the 1970s some Native American film roles began to show more complexity, such as those in Little Big Man ( 1970 ), Billy Jack ( 1971 ), and The Outlaw Josey Wales ( 1976 ), which depicted Native Americans in minor supporting roles.

By 1971, 250, 000 Cubans made use of this program.

By mid-1971, as the termination date of the British treaty relationship ( end of 1971 ) approached, the nine still had not agreed on terms of union.

By 1970 Macainsh was back with Strauks, now on drums, first in Claptrap and by 1971 in Frame which had Graeme " Shirley " Strachan as lead vocalist.

By Meddle ( 1971 ), specifically the suite " Echoes ", they moved in the direction of symphonic prog rather than psychedelic rock.

By 1971 the Unification Church of the United States had about 500 members.

By 1971 it was recognized by the New York Times as a " buzz word ".

By the end of 1971, Khan soon faced another war with India that lasted less than two weeks.

By 1971 the yen had become undervalued.

By 1971, the FCC introduced the Prime Time Access Rule, which freed local network affiliates in the top 50 markets ( in practice, the entire network ) to take a half hour of prime time from the networks on Mondays through Saturdays and one full hour on Sundays.

In other fictional television works, a January 1971 episode " By the Pricking of My Thumbs ..." of the British science fiction TV series Doomwatch featured a 16-year-old XYY boy expelled from school because of his genetic condition, a November 1993 episode " Born Bad " of the American police procedural TV series Law & Order portrayed a 14-year-old XYY sociopathic murderer, and the May 2007 season finale episode " Born To Kill " of the American police procedural TV series CSI: Miami depicted a 34-year-old XYY serial killer.

By 1971, diverging interests between the civilian and military wings of the leadership were apparent.

By 1989, Moscow had repudiated the Brezhnev Doctrine in favor of non − intervention in the internal affairs of its Warsaw Pact allies.

By the Leonid Brezhnev period democratic centralism was described, in the 1977 Soviet Constitution, as a principle for organizing the state: " The Soviet state is organized and functions on the principle of democratic centralism, namely the electiveness of all bodies of state authority from the lowest to the highest, their accountability to the people, and the obligation of lower bodies to observe the decisions of higher ones.

By 1976 Kirilenko's position within the Soviet leadership had grown to such an extent that leading officials, such as Brezhnev and Suslov, were beginning to worry about his " organisational tail " in the Russian Soviet Federative Socialist Republic ( RSFSR ).

By 1989, the Soviet Union had repudiated the Brezhnev Doctrine in favor of non-intervention in the internal affairs of its Eastern European allies, thereby fatally depriving the Eastern European regimes of the assurance of Soviet assistance and intervention in the event of popular uprising.

By the late 1930s, Stalin faithful engineers like Leonid Brezhnev, Alexei Kosygin and Nikita Khrushchev grew in influence, due to Stalin eliminating many earlier Bolshevik engineers.

By failing to do as he was told instantly -- to take out a permit or return the gun to his car -- he had played into Lord's hands.

By 1898, rustling losses had been driven down to the lowest level ever seen in Wyoming.

By the death of his father in 1888 he had come into possession of the family estate and had re-assumed its traditions.

By the time Lilian had been graduated from public school, her parents were doing quite well.

) By the time the streetcar pulled away, he had fallen in love with Paula.

By this time she had learned that it was futile to argue with her young husband, yet the uncomfortable fact remained: the American Congregationalists were sending them as missionaries to the Far East and paying their salaries.

By the age of six young Johnny indicated that he had the call.

By September 1940 the Suite had developed into a collection of six songs, `` four spirituals, a dream, and a lullaby ''.

By now he had become Regius Professor of Modern History at Cambridge and had been honored by the award of the Order of Merit.

By both standards Thomas had the right to be proud.

By June 19, 1788, he had presented himself to its Commander in Chief, the Governor of the Southern Provinces, the Director of the War College -- The Prince.

By 1783 her legions had managed to annex the Crimea amid scenes of wanton cruelty and now, in this second combat with the Crescent, were aiming at suzerainty over all of the Black Sea's northern shoreline.

By this time word had got around that an American doctor was on the premises.

By this time Woodruff had accurately measured Pike as a man of great personal pride, a man who would fly into a towering rage if his integrity were questioned, and who would be anxious to avenge himself.

By 1834 the art of oratory had reached a very high level in the United States as a literary form.

By the time he was under the covers he had forgotten about seeing Kate.

By 1937 he had clarified his intentions to serve his people: `` I have striven for clarity and melodious idiom, but at the same time I have by no means attempted to restrict myself to the accepted methods of harmony and melody.

By the time the film was released we were three million dollars over-spent, war was imminent and the public apparently had forgotten all about Mother Cabrini.

By this time Churchill was not so cordial toward moving Poland westward as he had been at Teheran, where he and Eden had both heartily approved the idea.

By December, 1958, when ' Abdallah Ibrahim became President of the Council, elections had even greater importance.

By 800 social and cultural security had been achieved, at least on a simple plane ; ;

By this time large numbers of the audience had left the hall.