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Poster reads: "Not all alien invaders are from outer space. The invasion has begun. Record numbers of uninvited species are destroying our natural resources and threatening U.S. ecosystems."
Nonindigenous pests -- United States -- Posters, Forest conservation -- United States -- Posters, Conservation of natural resources -- United States -- Posters, Nonindigenous pests
United States Department of Agriculture, "Invasive Species" (1999). U.S. Government Posters. 7.
Government Publications, Maps, and Microforms Department, Brooks Library, Central Washington University