Roger Norris Boyd, 73, a prominent government contracts lawyer and a founding partner in the Washington firm of Crowell & Moring, died of leukemia Nov. 29 at Inova Fairfax Hospital. He lived in Alexandria and Neavitt, Md.

Mr. Boyd, past co-chairman of the firm's government contracts law group, was considered a leading authority in the area of government contract costs and compliance with the Truth in Negotiations Act.

He published and lectured extensively on those and other topics. He was a council member of the American Bar Association's public contract law section and chairman of its cost committee and special committee on fraud.

He was also a member of the procurement planning committee and the contract finance subcommittee of the National Security Industrial Association and a visiting lecturer at George Washington University's law school.

Mr. Boyd was a native Washingtonian and a graduate of Gonzaga High School. He graduated magna cum laude from Bowdoin College, where he was elected Phi Beta Kappa and received honors in economics. He was a Fulbright scholar in economics at the University College of North Staffordshire, England, and received his law degree from Yale Law School.

He served six years in the Air Force as an electronic countermeasures officer and, since 1961, worked in private practice. In 1979, he joined with others to form Crowell & Moring, now a 280-lawyer firm principally located in Washington but with offices in Southern California, London and Brussels.

Mr. Boyd was a member of the Metropolitan Club.

Survivors include his wife of 50 years, Barbara Helen Boyd of Alexandria and Neavitt; two sons, Michael Boyd of Tampa and John Boyd of Charleston, S.C.; a sister; a brother; and four grandchildren.