100.000+ autores registrados con U · página 132
| Pioneer Women (Organization : U.S.) | — |
| Pioneer Women (Organization: U.S.) | — |
| Pittsburgh Research Center (U.S.) | — |
| Pittsburgh Safety and Health Technology Center (U.S.) | — |
| Planetary Geology and Geophysics Program (U.S.) | — |
| Planned Parenthood-World Population (U.S.) | — |
| Plant Genetics and Germplasm Institute (U.S.) | — |
| Plant Genome Data and Information Center (U.S.) | — |
| U.S. Plant Industry, Bureau of. Division of Plant Exploration and Introduction. | — |
| Plant Molecular Biology Laboratory (U.S.) | — |
| Plant Sciences Institute (U.S.) | — |
| U.S. Plant, Soil, and Nutrition Laboratory | — |
| Plastics Technical Evaluation Center (U.S.) | — |
| Plumbing-Heating-Cooling Contractors--National Association (U.S.) | — |
| Poale Zion (U.S.) | — |
| Poale-Zion (U.S.) | — |
| Poale Zion (U.S.) | — |
| Poland. Ambasada (U.S.) | — |
| Polar Research Board Staff National Research Council (U.S.) | — |
| Police Foundation (U.S.) | — |
| Police Foundation U.S. | — |
| Policy Panel on Access (U.S.) | — |
| Policy Panel on Access (U.S.). | — |
| Policy Panel on Technology and Its Ramifications for Data Systems (U.S.). | — |
| U.S.-Polish Symposium, Coal Surface Mining and Power Production in the Face of Environmental Protection Requirements (2nd 1979 Zamek Ksi aż ecy, Poland) | — |
| Populist Party (U.S.) | — |
| Port Chicago Naval Magazine (Agency : U.S.) | — |
| Portugal. Embaixada (U.S.) | — |
| Postal History Society (U.S.) | — |
| Poster Advertising Association (U.S.) | — |
| Power Management Laboratory (Program : U.S.) | — |
| Prairie School Society (U.S.) | — |
| Prairie States Forestry Project (U.S.) | — |
| Presbyterian Association of Musicians (U.S.) | — |
| Presbyterian Church in the U.S | — |
| Presbyterian Church in the U.S. | — |
| U.S. President, 1829-1837 (Jackson) | — |
| U.S. President, 1829-1837 (Jackson) | — |
| U.S. President, 1857-1861 (Buchanan) | — |
| U. S. President, 1877-1881 (Hayes) | — |
| U.S. President, 1885-1889 (Cleveland) | — |