Hartwig (Dr. George).
The Sea and its Living Wonders. With 12 Plates and 303 Woodcuts. 8vo., 7s. net.
The Tropical World. With 8 Plates and 172 Woodcuts. 8vo., 7s. net.
The Polar World. With 3 Maps, 8 Plates and 85 Woodcuts. 8vo., 7s. net.
The Subterranean World. With 3 Maps and 80 Woodcuts. 8vo., 7s. net.
The Aerial World. With Map, 8 Plates and 60 Woodcuts. 8vo., 7s. net.
Heroes of the Polar World. With 19 Illustrations. Cr. 8vo., 2s.
Wonders of the Tropical Forests. With 40 Illustrations. Cr. 8vo., 2s.
Workers under the Ground. With 29 Illustrations. Cr. 8vo., 2s.
Marvels Over our Heads. With 29 Illustrations. Cr. 8vo., 2s.