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“They have a backlist of children’s books second to none” — classic works like Nancy Drew and the Hardy Boys, Tom Swift and the Bobbsey Twins.

Dr. Metcalfe called himself and his collaborator “the Bobbsey Twins” of computing networking.

And I remember boxed sets of Laura Ingalls Wilder books my aunt mailed to me one Christmas when I had the chicken pox, an antique set of "Bobbsey Twins" mysteries our neighbors gave to me when they moved.

Plenty of well-regarded fiction for adults was written by Jews and featured Jewish characters, but children’s books, from “Little Women” to “Anne of Green Gables” and the Betsy-Tacy books to the Bobbsey Twins, largely featured kids who were Christian.

Books that I loved as a girl include the “All-of-a-Kind Family” series, the “Great Brain” books, “Little Women,” “Five Little Peppers and How They Grew,” the Bobbsey Twins, Nancy Drew, Trixie Belden and all of Judy Blume.