WASHINGTON (AP) — The Bush administration on Friday issued expanded guidelines advising colleges on how they may create diversity on campus without explicitly factoring race in recruiting or admissions.

The Education Department's 81-page guide of race-neutral school ideas doubles the scope of the government's initial report on the topic last March.

The report underscores that ensuring racial diversity is a challenge not just for universities but also for public schools, which train millions of potential college students.

The ideas, already being used in places across the country, include expanded Advanced Placement course offerings for poorer students, partnerships between colleges and low-performing schools and targeted college aid for students in low-income areas.

The department's original guide came out just before the Supreme Court heard arguments on the use of race in admissions at the University of Michigan. The court's eventual ruling made clear colleges can select students based in part on race but may not use rigid racial quotas.

The Bush administration, which opposes racial preferences, sided against Michigan in the case.

"The goal here is not to tell people what they cannot do or where the court-imposed limitations on racial or ethnic considerations may fall," Ken Marcus, who oversees civil rights for the department, wrote in the report. "Rather, we hope to highlight several approaches that appear, from early indications, to be promising."

The report, "Achieving Diversity: Race-Neutral Alternatives in American Education," can be ordered at 1-800-872-5327