Dr. Elgin E. Groseclose, 83, an economic and investment consultant and the author of a number of books, including "Ararat," a novel for which he won the National Book Award in 1939, died April 4 at Sibley Memorial Hospital after a stroke.

In 1944, Dr. Groseclose founded Groseclose Williams & Associates, a consulting firm specializing in tax evaluations, monetary questions, international investments and urban affairs. He remained active in this work until his death. In 1960, he organized the Institute for Monetary Research and since then had been its executive director.

Dr. Groseclose, who lived in Washington, was born in Waukomis, Okla. He graduated from the University of Oklahoma and later earned a master's and doctoral degrees at American University.

From 1920 to 1922, he did refugee work in Persia, Armenia and the Soviet Union, where he was arrested and held for a month. This formed the basis for the novel "Ararat."

About 1922, Dr. Groseclose moved to Washington and joined the Commerce Department. He later worked for the Guaranty Trust Co. and Fortune Magazine in New York and taught at the University of Oklahoma. He returned here in 1935 and worked for the Federal Communications Commission and the Treasury Department. He spent a year as an adviser to the government of Iran and then founded Groseclose Williams.

Dr. Groseclose was a director of the Washington Bible Society, a founder and former president of the Welfare of the Blind Inc. and a member of St. Alban's Episcopal Church, the Cosmos Club, the Kenwood Golf & Country Club and the National Economists.

Survivors include his wife, Louise, of Washington; four daughters, Jane Theodoropoulos of Redwood City, Calif., Nancy Witherspoon of Armonk, N.Y., Hildegarde Bender of Medina, Ohio, and Suzy San Soucie of Fort Collins, Colo.; a sister, Esther Damm of St. Louis; two brothers, Frank, of Fort Worth, and Herman, of Oklahoma City; 10 grandchildren, and three great-grandchildren.