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