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- Oxford University Press✖[remove]25
- Geoprojects (Firm)7
- Economist Intelligence Unit (Great Britain)2
- Hine, Robert2
- Martin, E. A. (Elizabeth A.)2
- University of Nairobi2
- Ady, Peter Honorine1
- Calhoun, Craig J., 1952-1
- Carvajal, Carol Styles1
- Chaundy, Theodore William, 1889-19711
- Galimberti Jarman, Beatriz1
- George Philip & Son1
- Horwood, Jane1
- Lewis, Clinton Gresham, Sir, 1885-1
- Mokyr, Joel1
- Royal Botanic Gardens, Kew1
- Russell, Roy, 1954-1