Bruhl, Paul . A Guide to the Orchids of Sikkim / Textual Documents Paul Bruhl. - 1st ed. / - Calcutta : Thacker, Spink & Co. , 1926. - 208p.xvi, : ill ; 17cm . Subjects--Index Terms: Botany Orchids G-Botany Dewey Class. No.: 581.166 / B 834 G