Lawrence R. Klein, 91, the editor in chief of Monthly Labor Review magazine for more than two decades and a proponent of lucid prose in government writing, died Sept. 23 at Mountain View Care Center in Tucson from complications following a heart attack.

Mr. Klein became an associate commissioner of the Bureau of Labor Statistics in 1946 and spent the next 22 years as editor in chief of Monthly Labor Review, which publishes research and news about labor economics. Among the reports he oversaw was a 1959 and 1960 study of the steel industry's collective-bargaining techniques.

Mr. Klein was also the bureau's director of publications and won its Eminent Achievement Award in 1968 for fusing technical and literary value in the magazine's issues.

In 1984, after retiring from a second career as a university lecturer in economics, he won a second Eminent Achievement Award for his continued promotion of clear writing.

Mr. Klein was born in Negaunee, Mich. He received a bachelor's degree in English from the University of Michigan in 1930 and worked the next few years as a reporter in Detroit.

Later, he was assistant to the director of the Michigan Emergency Welfare Administration. In the early 1940s, he was director of the Department of Statistics and Information of the National Refugee Service in New York and director of the Division of Industrial Information and Reports in the Michigan Department of Labor and Industry.

During World War II, he was an Army combat engineer stationed in England.

After he retired in 1968, a fund was started in his name to honor the best articles by a bureau and nonbureau author to write for the magazine each year.

While working in Washington, Mr. Klein lived in Arlington.

Starting in the late 1960s, Mr. Klein lectured in economics at the University of Kentucky and was also founding executive editor of Growth and Change: A Journal of Regional Development. He also taught economics at the University of Arizona when he moved to Tucson in 1971.

Mr. Klein was an avid reader. At age 60, he took up running. Each birthday he would add a mile to his regimen. At 72, he could run 12 miles.

Survivors include his wife of 66 years, Elsie R. Klein of Tucson; two children, Lawrence E. Klein of East Lansing, Mich., and Elea Mideke of Cascabel, Ariz.; and three grandchildren.