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Incoming Resources
- Humboldt's cosmos, Alexander von Humboldt and the Latin American journey that changed the way we see the world, Gerard Helferich
- An unlikely trust, Theodore Roosevelt, J. P. Morgan, and the improbable partnership that remade American business, Gerard Helferich
- An unlikely trust, Theodore Roosevelt, J.P. Morgan, and the improbable partnership that remade American business, Gerard Helferich