American fern journal - American Fern Society. (American Fern Society, 1972)

American fern journal - American Fern Society. (American Fern Society, 1974)

American fern journal - American Fern Society. (American Fern Society, 1975)

American fern journal - American Fern Society. (American Fern Society, 1976)

American fern journal - American Fern Society. (American Fern Society, 1978)

American fern journal - American Fern Society. (American Fern Society, 1980)

American fern journal - American Fern Society. (American Fern Society, 1981)

American fern journal - American Fern Society. (American Fern Society, 1982)

American fern journal - American Fern Society. (American Fern Society, 1983)

American fern journal - American Fern Society. (American Fern Society, 1984)

American fern journal - American Fern Society. (American Fern Society, 1985)

American fern journal - American Fern Society. (American Fern Society, 1986)

American fern journal - American Fern Society. (American Fern Society, 1987)

American fern journal - American Fern Society. (American Fern Society, 1988)

American fern journal - American Fern Society. (American Fern Society, 1989)

American fern journal - American Fern Society. (American Fern Society, 1990)

American fern journal - American Fern Society. (American Fern Society, 1991)

American fern journal - American Fern Society. (American Fern Society, 1992)

American fern journal - American Fern Society. (American Fern Society, 1993)

American fern journal - American Fern Society. (American Fern Society, 1994)

American fern journal - American Fern Society. (American Fern Society, 1995)

American fern journal - American Fern Society. (American Fern Society, 1996)

American fern journal - American Fern Society. (American Fern Society, 1997)