The Prince George's County Board of Education voted last night to establish 11 new magnet schools in the final phase of its four-year effort to desegregate county schools.

The board voted 8 to 1 to accept the plan by Superintendent John A. Murphy to expand the successful program from 11 specialties in 39 schools to 13 specialties in 50 schools. The vote came despite pleas from parents to delay the expansion, select different schools for magnets or reopen schools that closed several years ago.

The plan will establish six magnets in the fall and five in 1989, including traditional academic centers at two high schools and two new curriculums in communications and biotechnology. The plan also calls for another University High School at Laurel High that will replicate the program at Suitland High, the southern county school that has been called emblematic of President Reagan's educational priorities. The president gave an education policy speech at Suitland High last month.

The school system is bound by a federal court order that defines desegregated schools as those with no more than 80 percent of students of one race. Prince George's schools have met, or in some cases, exceeded that goal, school system spokesman Brian Porter said.

"One of the goals that people tend not to realize is that one of the criteria we're being evaluated on by the federal court is attainment of 85 percent {overall} enrollment in desegregated schools -- 85 percent of our student enrollment is supposed to be in desegregated schools by next fall," Porter said. "We're at 81 percent now. We're ahead of the ball game."

Catherine Burch, who cast the dissenting vote on the plan, said the county's regular schools have suffered because most resources are funneled to magnet schools and those in the so-called Milliken program, which get additional aid because they are seen as impossible to desegregate. She cited a library resources budget the board will discuss next week that she estimates will put only two new books in each school library.

"I realize we're under a court order. I feel magnet schools truly have been good to the county . . . but I also know that sacrifices in the county have been made to implement the program . . . at the expense of comprehensive schools."

Burch's comment prompted a sharp rebuke from Murphy, who had revised the magnet plan because of parental concerns about excessive busing.

"I don't think it's fair for us to mislead the people in this community on emotional issues. There's not a single shred of evidence that a comprehensive school in this community has suffered because of magnets," Murphy said.

He cited smaller classes and increased cost per pupil as evidence of improved education. He also reminded the board that the system receives federal and state dollars for the magnet program, money it wouldn't have if there were no magnet schools. And he warned the capacity audience that if the system does not meet its desegregation goals by 1990 it might be forced to use a $65 million backup busing plan developed in 1983 by then University of the District of Columbia president Robert L. Green.

Some parents still were not satisfied last night with the plan and said they felt the board had not listened to their concerns, but they indicated they would work with school officials. One such parent was Ken Johnson, president of the Largo High School Parent-Teacher-Student Association.

"I don't think the board addressed the real concerns of parents," said Johnson, who objected to the banking and finance magnet at Largo High School. "I'm not opposing magnets, I just want to have a strong academic program at Largo."

--------------------PROPOSED MAGNET PROGRAMS------------------------

---------TWO-YEAR PLAN FOR PRINCE GEORGE'S SCHOOLS------------------

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School.........Students...%Black...Program Recommendation

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HIGH SCHOOLS:

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Fairmont Heights..1,149.... 82.1...Magnet biotechnology program

Friendly..........1,803.... 73.0...Specialized college prep program

Forestville.......1,128.... 93.0...Magnet program for 1989-90 school

...................................year

Gwynn Park........1,109.... 45.2...Academic center -- continuity for

...................................incoming students from magnet

...................................middle schools

High Point........2,196.... 46.3...Academic center -- continuity for

...................................incoming students from academic

...................................center at Martin Luther King Jr.

...................................Middle School

Largo.............1,917.... 80.6...Boundary change to be proposed

...................................for 1989-90 to achieve racial

...................................balance

Laurel............1,529.... 22.5...Academic center -- continuity for

...................................incoming students from magnet

...................................middle schools

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MIDDLE SCHOOLS:

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Gwynn Park..........305.... 42.3...Science/math magnet program --

...................................continuity for incoming students

...................................from other magnet schools

Kettering...........810.... 73.3...Communications arts program,

...................................1989-90 -- continuity for incoming

...................................students from other magnet schools

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ELEMENTARY SCHOOLS:

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Kettering...........635.... 87.8...Communications arts program,

...................................1988-89. Maintain extended day

Phyllis E. Williams.636.... 88.3...Communications arts program in

....,..............................1989-90 (pending review of same

...................................program at Kettering Elementary

...................................in 1988-89). Maintain extended

...................................day

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Attendance boundary may change, sending some students to Frederick Douglass

High.

Ninety black students would be given preferential slots in magnet programs

at Beltsville and Samuel Ogle elementary and Pullen middle schools.

SOURCE: Prince George's County Schools.