Plant indicators the relation of plant communities to process and practice This book, "Plant indicators the relation of plant communities to process and practice", by Frederic E. Clements, is a replication of a book originally published before 1920. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.