1
प्रकाशित: 1988
Superior document: Smithsonian contributions to botany Number 72
2
प्रकाशित: 1989
Superior document: Smithsonian contributions to botany Number 69
3
प्रकाशित: 1989
Superior document: Smithsonian contributions to botany Number 68
4
प्रकाशित: 1985
Superior document: Smithsonian contributions to botany 59
5
प्रकाशित: 1987
Superior document: Smithsonian contributions to botany Number 65