Robert H. Lyddan, 79, a retired chief of the Topographic Division at the U.S. Geological Survey, died of cancer June 26 at Fairfax Hospital.

Mr. Lyddan, who lived in Reston, was a native of Kentucky and a graduate of the University of Kentucky. He worked for two years for the Interstate Commerce Commission before joining the USGS as a junior engineer in 1933.

His early USGS duties included mapping along the East Coast and in Alaska and Puerto Rico. He came to Washington in 1946 when he was appointed chief of the Plans and Coordination Branch in the Topographic Division. He was named Atlantic Region Engineer in 1956 and an assistant director of the USGS a year later.

He became chief of the Topographic Division in 1968. While there, he implemented programs to take advantage of such technical advances in map making as remote sensing from satellites. He retired in 1977.

In 1970, he headed the U.S. delegation to the 6th U.N. Conference on Cartography. In 1971, he was a member of the U.S. Delegation to the Commonwealth Survey Officers Conference in England. From 1973 to 1977 he was the U.S. member of the Commission on Cartography at the Pan American Institute of Geography and History in Mexico City.

He was a 1960 recipient of the Distinguished Service Award from the Department of the Interior.

Mr. Lyddan was a member of the American Society of Civil Engineers, the American Congress of Survey and Mapping and the American Society of Photogrammertry and Remote Sensing.

Survivors include his wife, Anne Lyddan of Reston; three children, Nancy Lyddan of Hawaii, Kathleen Ortt of Sterling and Christopher Lyddan of Manquin, Va; two sisters, Helen Lyddan of Sarasota, Fla., and Mary T. Martin of Greensboro, N.C.; and two grandchildren.

MARY ELLIS KAHLER

Historian

Mary Ellis Kahler, 70, a historian and a retired senior specialist in Hispanic bibliography at the Library of Congress, died June 26 at the Medical College of Virginia Hospitals in Richmond from complications following heart surgery.

Dr. Kahler came to the Washington area in 1949 when she went to work at the Library of Congress as an intern. She became chief of the serial record division in 1957 and the Hispanic Division in 1973. From 1978 to 1981, she was field director of the Library of Congress office in Rio de Janeiro. She then returned to the Hispanic Division, where her duties included work on various Hispanic manuscripts. She retired in 1988.

Among the works she edited is the "The Harkness Collection in the Library of Congress: Manuscripts Concerning Mexico: A Guide."

Dr. Kahler, who lived in Falls Church, was born in Santiago, Chile. She came to the United States about 1930 and grew up in Pennsylvania. She was a graduate of Swathmore College. She received a master's degree in library science from Drexel University in Philadelphia and a master's degree in history from George Washington University. She recieved a doctoral degree in history from American University.

Dr. Kahler was a past chairman of the Scholarly Resources Committee of the Latin American Studies Association and a board member of the Seminar on the Acquisition of Latin American Library Materials. She was a member of the Society for Spanish and Portuguese Historical Studies, the Brazilian-American Cultural Institute and the Society of American Archivists.

Survivors include her husband of 40 years, George W. Kahler of Falls Church.

ROBERT E. MARGINOT

Insurance Risk Manager

Robert E. Marginot, 57, an insurance risk manager who most recently was chief of risk and insurance for Loudoun County, died of lung and liver ailments June 25 at a hospital in Reno, Nev. He was attending a professional meeting when he became ill.

Mr. Marginot, who lived in Harper's Ferry, W.Va., was born in Boston. He moved to the Washington area in 1942 and graduated from St. John's College High School. He served in the Army during the Korean war, then graduated from Georgetown University. He also attended the Risk Management Insurance Institute of America.

From 1961 to 1971 Mr. Marginot managed the insurance risk programs of Atlantic Research Corp. and the Susquehanna Corp., both in Alexandria. He was an insurance risk manager in Dallas from 1972 to 1977, when he became an insurance risk manager in the office of the Maryland state treasurer. Since 1985 he had been chief of risk and insurance for Loudoun County.

He was a member of the boards of directors and a former president of the Virginia Public Risk Management Association and the Potomac chapter of the Risk and Insurance Management Society.

Survivors include his wife, Lois J. Marginot of Cabin John; two children, John D. Marginot of Cabin John and Sandra L. Marginot of Annapolis; two brothers, William H. Marginot of Panama City, Fla., and Charles F. Marginot of Vienna; four sisters, Dorothy Ahern of Naples, Fla., Patricia Busi of Cabin John, Jean M. Foster of Gaithersburg and Phyllis Schmoyer of Warrington, Pa.; and a grandchild.

OWEN MURRAY HINES

Marine Colonel

Owen Murray Hines, 85, a retired colonel in the Marine Corps and a former Alexandria resident, died of cancer June 27 at Suburban Hospital in Louisville.

Col. Hines, a resident of Louisville, was born in Nashville. He graduated from Vanderbilt University. In 1932, he was commissioned in the Marine Corps.

During World War II, he served in the Pacific as an aviation control officer. After the war he was stationed in California and Chicago until 1955, when he was transferred to Headquarters Marine Corps in Washington. He remained there until retiring in 1964 as deputy director of reserve personnel.

Col. Hines was a member of the Washington Golf and Country Club and the Army & Navy Club. He lived in Alexandria until moving to Louisville in 1970.

His first wife, Harriett Hines, died in 1968.

Survivors include his wife, Kate Hines of Louisville; three children by his first marriage, Owen M. Hines Jr. of Nashville, Kate H. Points of Louisville and Harriet H. Carlin of Alexandria; two brothers, the Rev. Vincent Hines of Gatlinburg, Tenn., and Edward Hines of Nashville; two sisters, Margaret Hines of Nashville and Mary Catherine Duggan of Florida; and five grandchildren.

CLAYRE BLAVATT

Volunteer

Clayre Blavatt, 76, a longtime volunteer with charitable groups in Washington, died June 26 at Holy Cross Hospital after a stroke.

Mrs. Blavatt, who lived in Silver Spring, was born in Cleveland. She moved to the Washington area about 1935.

During World War II, she was chairman of the war-bond section of the Washington chapter of the American Women's Volunteer Service. She later helped organize a Meals On Wheels service for the Jewish Social Service Agency and in the early 1950s, was president of the Washington chapter of Aid To All Charities Inc., a fund-raising organization.

She had been a Blood Mobile driver with the American Red Cross and a reading volunteer at Children's Hospital.

Survivors include her husband, Samuel Blavatt of Silver Spring; two sons, Ronald Blavatt of Baltimore and Bryan A. Blavatt of Bowie; two sisters, Maryland District Court Judge Bess Lavine of Adelphi and Ruth Gordon of Miami, Fla.; and four grandchildren.

ELIZABETH K. BAYLESS

Cataloger

Elizabeth K. Bayless, 72, a retired subject cataloger at the Library of Congress, died June 22 at Fauquier Hospital in Warrenton following surgery for an ulcer.

Mrs. Bayless, who lived in Warrenton, was a native of Oklahoma. She was a graduate of the University of Oklahoma, where she earned a master's degree in library science.

She came to the Washington area during World War II. She became a researcher at the U.S. Chamber of Commerce in 1967. In the early 1970s, she left to study for her master's degree. She returned here in the mid-1970s and worked at the Library of Congress. She retired in 1984.

Her marriage to Glen Bayless ended in divorce.

Survivors include two children, Cynthia Gallois of Brisbane, Australia, and Glen Bayless Jr. of Sterling; a sister, Winifred Scott of Upland, Calif.; a brother, Richard Keys of Denver; and two grandchildren.