Bhatnagar , S.P. . Gymnosperms / Textual Documents S.P. Bhatnagar & Alok Moitra. - 1st ed / - New Delhi : New Age International ( P ) Limited , 1996. - 470p. : ill ; 23cm. . Index ISBN: 81-224-0792-7 Subjects--Index Terms: Botany Gymnosperms PG-Botany Dewey Class. No.: 585 / Bh 469 Gy