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, Brezhnev had succeeded in becoming first amongst equals in the Politburo and the Central Committee.

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 1970, both Parton and Wagoner had grown frustrated by her lack of solo chart success, and Porter had her record Jimmie Rodgers ' " Mule Skinner Blues ", a gimmick that worked.

By the end of that year he was frustrated with court life and started seeking another appointment.

By 1499, however, Cardinal Francisco Jiménez de Cisneros grew frustrated with the slow pace of the efforts of Granada's first Archbishop, Fernando de Talavera, to convert non-Christians to Christianity and undertook a program of forced Christian baptisms, creating the Converso ( convert ) class for Moors and Jews.

By mid-1330, Isabella and Mortimer's regime was increasingly insecure, and Isabella's son, Edward III, was growing frustrated at Mortimer's grip on power.

By March, an increasingly frustrated Jefferson was resolved to enforce the embargo to the letter.

By the time Holly arrived at the venue that Monday evening, he was frustrated with the tour bus.

By this time Cain was becoming frustrated at the reluctance of his government's caucus members to approve his plans for tax rises and spending cuts to reduce the growing budget deficit.

By 1782 Vergennes was growing increasingly frustrated by what he regarded as the inability of the United States to justify its use of the large sums of money which France had given them.

By 1970, Emerson and the other band members were frustrated with their lack of mainstream success and they soon broke up.

By the late 1970s, the story lines had the adult characters becoming increasingly frustrated with Big Bird using Snuffleupagus as a scapegoat whenever something went wrong while they were out of the room.

By now she was frustrated at being typecast in parts as poor women.

By early September, Cromwell was already said to have been growing frustrated with the assembly's in-fighting between different groups.

By 1924, many UFA Members of the Legislative Assembly ( MLAs ) wanted to see Greenfield leave office, both because they were frustrated with his failings and because they thought it likely that a Greenfield-led government would be defeated in the next election.

By July a frustrated Grey decided to act on his own to take Weraroa, which he claimed was the key to the occupation of the West Coast.

By the sixth day of the siege the gunmen had become increasingly frustrated at the lack of progress in meeting their demands.

By August 1861, Yancey was sick, frustrated, and ready to resign.

By 1996, Chan was beginning to get frustrated at the lack of progress.

By the 1857 general election, Know-Nothings had grown frustrated with Johnson's inability to deal with the San Francisco Vigilantes.

By the mid-1970s, Kostin had lost most interest in the construction industry, and was frustrated with the low fixed salary.

By 1949, Donald had become frustrated by his isolation in a small Southern California town, and separated from Mary, Don sought further treatment at the Harkness Pavilion in New York.

By the mid-late 1860s the preponderance of the objectives of the Chartist movement had largely been frustrated.

By the time the group members returned to San Francisco they were broke and frustrated at Katz's attempts to manipulate their career.

By 1981, however, Freeman had become frustrated with what he called " office politics " and decided to leave the company.

By 1953, both Ramo and the Air Force had become increasingly frustrated with management problems at Hughes.