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- United States. Congress. House47
- Pan American Union20
- International Bureau of the American Republics12
- United States. Department of Commerce and Labor. Bureau of Statistics9
- Mexico8
- Mexico. Secretaría de Comunicaciones y Transportes7
- Rowe, L.S., (Leo Stanton)7
- Phillips, Matilda6
- United States. Department of Commerce and Labor. Bureau of Manufactures6
- United States. Department of State6
- United States. Congress. Senate5
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)4
- Manger, William, 1899-19944
- Mexico. Dirección General de Estadística4
- Newhall, Beatrice4
- Smith, H. Gerald4
- Brainerd, Heloise3
- De Alba, Pedro3
- Hall, Robert King3
- Macedo, Pablo3