Step, E. Wayside and woodland ferns : a pocket guide to the British ferns, horsetails ans club-mosses / by Edward Step , with coloures figures of every species by Mabel E. Step and 67 photographs by the author; E. Step .— : Frederick Warne & CO., 1908 .— 285 с. — Lang: eng .— URL: https://rucont.ru/efd/118803 (дата обращения: 26.06.2024)