Nature-study readers - Troeger, John W. (John Winthrop), 1849-; Troeger, Edna Beatrice (New York, D. Appleton and company, 1897)
I. Harold's first discoveries, by J. W. Troeger.--II. Harold's rambles, by John W. Troeger.--III. Harold's quests, by John W. Troeger.--IV. Harold's explorations, by John W. Troeger and Edna Beatrice Troeger.--V. Harold's discussions, by John W. Troeger and Edna Beatrice Troeger.
Vols. 1-4, series title also at head of t.-p.
Keywords: Natural history -- Juvenile literature; Readers -- Natural history