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"The Outdoor Girls on Pine Island; Or, A Cave and What It Contained" is a book in the "Outdoor Girls" series, written by Laura Lee Hope, a pseudonym used by the Stratemeyer Syndicate, a group of authors who produced series books for children in the early 20th century.This installment follows the adventures of the Outdoor Girls—Betty Nelson, Mollie Billette, Grace Ford, and Amy Stonington—as they embark on a new adventure on Pine Island. The plot likely revolves around the girls' discovery of a mysterious cave and their subsequent exploration of it, uncovering secrets and solving mysteries along the way.The "Outdoor Girls" series was popular among young readers for its adventurous plots, relatable characters, and themes of friendship and independence. Each book typically features the girls engaging in outdoor activities, solving mysteries, and demonstrating resourcefulness and courage.