American fern journal - American Fern Society. (American Fern Society, 1928)

American fern journal - American Fern Society. (American Fern Society, 1931)

American fern journal - American Fern Society. (American Fern Society, 1932)

American fern journal - American Fern Society. (American Fern Society, 1933)

American fern journal - American Fern Society. (American Fern Society, 1934)

American fern journal - American Fern Society. (American Fern Society, 1935)

American fern journal - American Fern Society. (American Fern Society, 1936)

American fern journal - American Fern Society. (American Fern Society, 1937)

American fern journal - American Fern Society. (American Fern Society, 1938)

American fern journal - American Fern Society. (American Fern Society, 1939)

American fern journal - American Fern Society. (American Fern Society, 1940)

American fern journal - American Fern Society. (American Fern Society, 1942)

American fern journal - American Fern Society. (American Fern Society, 1943)

American fern journal - American Fern Society. (American Fern Society, 1944)

American fern journal - American Fern Society. (American Fern Society, 1945)

American fern journal - American Fern Society. (American Fern Society, 1946)

American fern journal - American Fern Society. (American Fern Society, 1947)

American fern journal - American Fern Society. (American Fern Society, 1948)

American fern journal - American Fern Society. (American Fern Society, 1949)

American fern journal - American Fern Society. (American Fern Society, 1950)

American fern journal - American Fern Society. (American Fern Society, 1951)

American fern journal - American Fern Society. (American Fern Society, 1952)

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)