Dave Porter at Bear Camp or The Wild Man of Mirror Lake (1915‪)‬

Popular children's adventure, first published in 1915, part of the Dave Porter series. According to Wikipedia: "Edward Stratemeyer (October 4, 1862 – May 10, 1930) was an American publisher and writer of books for children. He wrote in excess of 1300[1] books himself, selling in excess of 500 million copies[2], and created the well-known fictional book series for juveniles including The Rover Boys (starting in 1899), The Bobbsey Twins (starting in 1904), Tom Swift (starting in 1910), The Hardy Boys (starting in 1927), and the Nancy Drew (starting in 1930) series, among others."