A federal grand jury in Baltimore yesterday indicted the former head of the General Services Administration's 30 office supply centers in the Washington region.

Albert A. Matera, who charged by the grand jury with accepting a bribe of carpeting from an office supply firm, is the highest level GSA official to be indicted in continuing investigations of GSA. He retired from GSA in December.

The grand jury also indicted eight other persons, including three officers of office supply firms who allegedly gave bribes so that GSA officials would certify they supplied goods that were never sent.

The new indictments bring the number of people charged in connection with the GSA investigations to 55. Of those indicted, 42 have pleaded guilty or been convicted in courts in Washington and Baltimore.

More indictments are expected in Baltimore in the next six to eight weeks, said Assistang U.S. Attorney Daniel M. Clements, who supervised the investigation with Assistant U.S. Attorney Elizabeth H. Trimble.

The indictment of Matera, 66, of Alexandria, charges that he "unlawfully and knowingly" demanded and accepted carpeting from Thomas R. Willimgham, president of Atlantic Office Suplly Company of Bladensburg, of "official acts" performed for Willimgham. The alleged acts were not disclosed.

Willimgham, 41, of Arnold, Md., was charged in an indictment yesterday with bribing GSA employes with television sets, radios, microwave ovens, carpeting, stereos and cash so they would approve payments for goods never delivered by his firm.

Until December, Matera earned $34,773 a year as chief of retail operations in the retail srvices division of GSA's Region 3, which covered five states and Washington.

Twenty-seven of those indicted by the Baltimore grand jury so far were managers, assistang managers, or supervisors of managers of the office supply centers under Matera's direction.

If convicted, Matera could be sentenced to two years in prison and a $10,000 fine.

Also indicted by the grand jury yesterday were:

Alberto L. Esteva, 43, of Laurel, vice president of Atlantic Office Supply Co. He is alleged to have provided GSA employes with bribes like television sets and ovens in exchange for approval of payments for goods never delivered by the company.

William T. Chester, 34, of Baltimore, president of Hue Chemical Sales in Baltimore, Chester is charged with making a false claim to the government by submitting a bill for 25 cases of trash can liners and wire belting that he allegedly knew and never been delivered to GSA.

Drema K. Brocato, 34, of Perry Hall, Md., a maintenance and supply clerk at the Army Publications Center of Middle River, Md. He allegedly received a television, a vacuum cleaner, and a citizen's band radio for signing papers certifying he received goods never received.

Alan M. Cooper-bey, 29, of Laurel, a former supply clerk at the Army Intelligence Agency at Fort Meade, Md. He allegedly received car tires and other items for certifying goods were received by GSA when they were not.

Orval Ray Glisson, 31, of Burkittsville, Md., a former supply clerk with the Consumer Products Safety Commission in Bethesda. He allegedly received two go-carts and a fireplace set for certifying that goods never received awere delivered to GSA.

Gloria W. Jones, 27, of Jacksonville, Fla., a former supply clerk with the Army Intelligence Agency at Fort Meade. She allegedly submitted bills to GSA for goods never delivered.

Bernard S. Tinsley, 44, of Greensboro, Md., a former Coast Guard store keeper at Curtis Bay, Md. He allegedly received car tires for certifying he received goods never delivered.