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