The previous page is sending you to https://www.cambridge.org/core/services/aop-cambridge-core/content/view/C18082910C9A23826525652964E61FE0/S0024282996000205a.pdf/the-lichen-vegetation-of-chalk-and-limestone-streams-in-britain.pdf.

 If you do not want to visit that page, you can return to the previous page.