| Northrop, H.D., 1889. Wonders of the tropics, or, Explorations and adventures of Henry M. Stanley and other world renowned travelers : including Livingstone, Baker, Cameron, Speke, Emin Pasha, Du Chaillu, Andersson, etc., etc., containing thrilling accounts of famous expeditions ... the whole comprising a vast treasury of all that is marvelous and wonderful in the dark continent. Chicago Ill. and Philadelphoa Pa, L.P. Miller & Co
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| Northrop, H.D., 1887. Earth, sea and sky, or, Marvels of the universe: being a full and graphic description of all that is wonderful in every continent of the globe, in the world of waters and the starry heavens : containing thrilling adventures on land and sea. St. John, N.B., R.A.H. Morrow
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