Beatrice Schenk de Regniers, 85, an award-winning author of nearly 50 children's books and the editor of Scholastic Book Services' Lucky Book Club for youngsters from 1961 to 1981, died March 1 at her home in Washington after a stroke.

Her book "May I Bring a Friend?," which had illustrations by Beni Montresor, received the American Library Association's Randolph Caldecott Medal in 1965.

Mrs. de Regniers collaborated with illustrator Maurice Sendak on two books, "The Giant Story" in 1953, and "What Can You Do With a Shoe" in 1955 and its reissue in 1997.

Michael Dirda wrote in The Washington Post Book World that the reissue was a "well-nigh irresistible" tale of two young siblings who tease each other while discussing amusing uses for a shoe, like stuffing it with pickles or popcorn or glue.

Using the pseudonym Tamara Kitt, Mrs. de Regniers wrote "The Adventures of Silly Billy" in 1961, among other titles.

She said her upbringing inspired her stories. "I think the way young children feel today--the way they feel deep inside--is the way children have always felt: bewildered, happy, sad, scared, friendly, angry, jokey, lonely," she once wrote. "That is why a book for young people that honestly has its roots in the author's feelings as a child is not likely to seem old-fashioned or out-of-date."

Mrs. de Regniers, who came to the Washington area in the mid-1990s, was born in Lafayette, Ind., and attended the University of Chicago. Before writing books, she was a professional dancer and edited American Heart Association publications.

She adopted some of her works for the theater, including the musical "Everyone Is Good for Something," produced in Louisville, Ky., in 1986.

Her husband, Francis de Regniers, died in 1992. Survivors include a sister, Lillian F. Goldman of Washington.