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Qator 18:
==Manbalar==
<ref name=dobson>F.S. Dobson (2000) Lichens, an illustrated guide to the British and Irish species. Richmond Publishing Co. Ltd., Slough, UK</ref>
<ref name="Morris2007">{{cite book |author=Morris J, Purvis W. |title=Lichens (Life) |publisher=The Natural History Museum |location=London |year=2007 |page=19 |isbn=0-565-09153-0 |oclc= |doi= |accessdate=}}</ref>
<ref name=ferry>Ferry, B.W., Baddeley, M.S. & Hawkworth, D. L. (Editors) (1973) Air Pollution and Lichens. Athlone Press, London.</ref>
<ref name=rosehawksworth>
<ref name=Hawksworthrose1976>D.L. Hawksworth and F. Rose(1976) Lichens as pollution monitors. Edward Arnold, Institute of Biology Series, No. 66. 60pp. ISBN 0713125543: 0713125551(pbk.)</ref>
{{reflist}}
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