Search Results       Your search for [author]Singson, Evangeline C. returned 1 record.           Lichens (Parmelia parlata and Usnes barbala) as indicators of air pollution. by Singson, Evangeline C.; 1994. Subject: Air -- Pollution -- Measurement; Plants, Effects of air pollution on; Lichens -- Effects of air pollution on -- Genetic aspects.          Add to Book Cart Relevance: 16.94%