Ruth B. Lederer, 68, a member of the Montgomery County Council of Landlord and Tenant Affairs and a former head of the Montgomery County Tenants Association Inc., died of a heart ailment Jan. 10 at her home in Friendship Heights.

Mrs. Lederer had been active in tenant affairs in Montgomery County since the early 1970s. A founder of the tenants association, she had been a frequent spokesman in behalf of tenant interests and on occasion she wrote about them in The Washington Post. She was the tenant member of the Council of Landord and Tenant Affairs, which hears disputes between landlords and tenants.

She also was a member of the village council of Friendship Heights and was active in Democratic Party affairs in Maryland.

Mrs. Lederer was born in Youngstown, Ohio. She attended Cayahoga Community College in Cleveland and earned an associate degree in library science. She moved to the Washington area in 1971.

She worked for the University of Maryland library until 1973, when she joined Amtrak. She was in charge of property services in its Washington headquarters when she retired in 1985. Since then she had worked for an insurance agency in Bethesda.

Mrs. Lederer was a member of the Smithsonian Associates, the Friends of the Kennedy Center, the Wolf Trap Associates, the Washington Performing Arts Society, the National Symphony Orchestra Association, the Metropolitan Museum of Art in New York, Americans for Democratic Action, the American Civil Liberties Union, the NAACP, the U.S.-China Peoples Friendship Association and the Council of Jewish Women. She was a docent at the Corcoran Gallery of Art.

Her marriage to Herbert A. Rosenthal ended in divorce. Her second husband, Harry T. Lederer, died in 1969.

Survivors include two sons by her first marriage, Herbert A. Rosenthal of Bethesda and Stuart S. Rosenthal of Boca Raton, Fla.; one sister, Edith Engelman of Columbus, Ohio, and three grandchildren.

RICHARD C. COUPLAND,

94, a retired Air Force major general who was an ordnance specialist for most of his military career, died of cancer Jan. 10 at the Powhatan Nursing Center in Falls Church.

At his retirement in 1951, Gen. Coupland was commanding officer of what then was the Air Materiel Armament Test Center at Eglin Air Force Base, Fla. He had previously served in Washington as chief of Air Force ordnance, a post he assumed when the Air Force became a separate service in 1947. During his career he was involved in the testing and development of a variety of weapons and munitions for aircraft.

A native of West Point, Va., Gen. Coupland was a graduate of Virginia Military Institute where he also received a master's degree in electrical engineering. He studied at the U.S. School of Military Aeronautics at Cornell University.

During World War I, he took pilot's training in Italy, then served with an Army artillery unit in France. Most of his service between the wars and during World War II was in Washington where he held a variety of ordnance-related assignments.

Upon his retirement, Gen. Coupland moved to Gibson Island, Md., where he lived until recently moving to Falls Church. During the 1950s he worked for the Koppers Co. in Baltimore as an adviser on acquisitions of companies engaged in munitions and other types of manufacturing.

His decorations included the Distinguished Service Medal, the Legion of Merit and the Most Excellent Order of the British Empire.

Survivors include his wife of 65 years, Isabel Coupland of Falls Church; two sons, Richard C. Coupland Jr. of Annandale and William R. Coupland of Fairfax; one brother, Leonard Temple Coupland of Mission Viejo, Calif.; one sister, Mildred Coupland of Virginia Beach, and four grandchildren.

JOHN K. CRAWFORD,

70, a retired Navy lieutenant commander who later investigated air crashes for the National Transportation Safety Board, died of a heart ailment Dec. 31 at Doctors' Hospital of Prince George's County.

Cmdr. Crawford, who lived in Severn, Md., was born in Butte, Mont. He had 15 years of intermittent Navy service before he retired from the Navy in the early 1960s. He was a Navy pilot in the Pacific during World War II and Korea, and he helped organize a NATO airport in Italy.

Since 1962 he had lived in this area, and he had worked for the Civil Aeronautics Board and the National Transportation Safety Board. He retired in 1982 as special assistant to the director of the technical services division.

He had also sold real estate in Prince George's County.

Cmdr. Crawford was a member of the Maryland Society of the Sons of the American Revolution, a Kentucky Colonel and a charter member of the Society of Air Safety Investigators.

Survivors include his wife, Carol Butkovich Crawford of Severn; one daughter, Kaye Elizabeth Crawford of San Pedro, Calif., and one sister, Frances Epling of Berea, Ky.