American fern journal - American Fern Society. (American Fern Society, 1953)

American fern journal - American Fern Society. (American Fern Society, 1954)

American fern journal - American Fern Society. (American Fern Society, 1955)

American fern journal - American Fern Society. (American Fern Society, 1956)

American fern journal - American Fern Society. (American Fern Society, 1957)

American fern journal - American Fern Society. (American Fern Society, 1958)

American fern journal - American Fern Society. (American Fern Society, 1959)

American fern journal - American Fern Society. (American Fern Society, 1960)

American fern journal - American Fern Society. (American Fern Society, 1961)

American fern journal - American Fern Society. (American Fern Society, 1962)

American fern journal - American Fern Society. (American Fern Society, 1963)

American fern journal - American Fern Society. (American Fern Society, 1964)

American fern journal - American Fern Society. (American Fern Society, 1965)

American fern journal - American Fern Society. (American Fern Society, 1966)

American fern journal - American Fern Society. (American Fern Society, 1967)

American fern journal - American Fern Society. (American Fern Society, 1968)

American fern journal - American Fern Society. (American Fern Society, 1970)

American fern journal - American Fern Society. (American Fern Society, 1971)

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