Old America - Ancient Peru (Continued) (12) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (12)." Juvenile Instructor 11, no. 9 (1876): 98-99.
Old America - The Toltecs (2) Ottinger, G.M.. "Old America - The Toltecs (2)." Juvenile Instructor 10, no. 8 (1875): 87-88.
Old America - The Aztecs (Continued) Ottinger, G.M.. "Old America - The Aztecs (Continued)." Juvenile Instructor 10, no. 5 (1875): 52-53.
Old America - Ancient Peru Ottinger, G.M.. "Old America - Ancient Peru." Juvenile Instructor 10, no. 24 (1875): 287-288.
Old America - The Mound Builders (Continued) (2) Ottinger, G.M.. "Old America - The Mound Builders (Continued) (2)." Juvenile Instructor 10, no. 20 (1875): 230-231.
Old America - Ancient Peru (Continued) (2) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (2)." Juvenile Instructor 10, no. 25 (1875): 290-291.
Old America - Ancient Peru (Continued) (11) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (11)." Juvenile Instructor 11, no. 8 (1876): 87-88.
Old America - Ancient Peru (Continued) (10) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (10)." Juvenile Instructor 11, no. 7 (1876): 74-75.
Old America - Ancient Peru (Continued) (9) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (9)." Juvenile Instructor 11, no. 6 (1876): 63-64.
Old America - Ancient Peru (Continued) (3) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (3)." Juvenile Instructor 10, no. 26 (1875): 302-303.
Old America - Ancient Ruins (7) Ottinger, G.M.. "Old America - Ancient Ruins (7)." Juvenile Instructor 10, no. 17 (1875): 194-195.
Old America - Ancient Peru (Continued) (5) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (5)." Juvenile Instructor 11, no. 2 (1876): 15.
Old America - Ancient Peru (Continued) (8) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (8)." Juvenile Instructor 11, no. 5 (1876): 51-52.
Old America - Ancient Ruins (4) Ottinger, G.M.. "Old America - Ancient Ruins (4)." Juvenile Instructor 10, no. 14 (1875): 167-168.
Old America - Ancient Peru (Continued) (7) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (7)." Juvenile Instructor 11, no. 4 (1876): 40-41.
Old America - Ancient Peru (Continued) (4) Ottinger, G.M.. "Old America - Ancient Peru (Continued) (4)." Juvenile Instructor 11, no. 1 (1876): 8-9.
Old America - The Mound Builders (Continued) (4) Ottinger, G.M.. "Old America - The Mound Builders (Continued) (4)." Juvenile Instructor 10, no. 22 (1875): 254-255.
Old America - The Mound Builders (Continued) (3) Ottinger, G.M.. "Old America - The Mound Builders (Continued) (3)." Juvenile Instructor 10, no. 21 (1875): 244-245.
Old America - The Muyscas Ottinger, G.M.. "Old America - The Muyscas." Juvenile Instructor 10, no. 23 (1875): 266-267.
