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- Great Britain✖[remove]67
- Great Britain. Department of Scientific and Industrial Research8
- Great Britain. Forest Products Research8
- Great Britain. Forestry Commission8
- Great Britain. War Office. General Staff. Geographical Section7
- Great Britain. Ministry of Labour. Manpower Research Unit5
- Great Britain. Foreign Office. Historical Section4
- United States. Army Map Service4
- American Geographical Society of New York2
- Bryan, J.2
- Burdon, John Alder, Sir, 1866-19332
- Costa Rica2
- Great Britain. Directorate of Overseas Surveys2
- Great Britain. Parliament. House of Commons2
- Walton, John, 1895-19712
- Alexander, W. B.1
- Andriesse, J. P.1
- Bassindale, R.1
- Bateson, Richard Gordon1
- Brown, H. H. (Herbert H.)1