| Title: | Organ Pipe Cactus National Monument, Ecological Monitoring Program, annual report 1993 |
| Author: | National Park Service Cooperative Park Studies Unit (Tucson, Ariz.) |
| Author: | United States. National Park Service |
| Author: | Organ Pipe Cactus National Monument (Ariz.). Division of Natural and Cultural Resources Management |
| Note: | National Biological Service, Cooperative Park Studies Unit, The University of Arizona ;, 1995 |
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| Subject: | Environmental monitoring -- Arizona -- Organ Pipe Cactus National Monument |
| Subject: | National monuments -- Arizona -- Organ Pipe Cactus National Monument |
| Subject: | Organ Pipe Cactus National Monument (Ariz.) -- Environmental aspects |
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