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Periodical

SENTINELS OF FOREST HEALTH.

Subjects: LICHENS; FORESTS & forestry & the environment; POLLUTIONUNITED States

  • Source: Science News. 11/26/2016, Vol. 190 Issue 11, p20-23. 4p. 6 Color Photographs, 1 Graph, 1 Map.

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Periodical

CHANGE IN THE AIR.

Subjects: AIR pollution; COVID-19 pandemic; STAY-at-home orders

  • Source: Time for Kids Teacher's Guide (Grades 5-6). 4/17/2020, Vol. 10 Issue 22, p2-2. 1p. 1 Color Photograph.

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  • 1-7 ل  7 نتائج ل ""Nitrogen Dioxide""