Intelligence in plants and animals: being a new edition of the author's privately issued "Soul and immortality." - Gentry, Thomas G. (Thomas George), 1843 -1905 (Doubleday, Page & Co, 1900)

International catalogue of scientific literature - Royal Society (Great Britain) (Published for the International Council by the Royal Society of London, 1909)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1934)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1935)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1936)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1938)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1939)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1940)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1942)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1945)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1947)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1949)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1950)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1952)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1953)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1954)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1955)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1956)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1957)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1958)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1959)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1960)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1961)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1962)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1963)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1964)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1965)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1967)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1968)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1969)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1970)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1971)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1972)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1973)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1974)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1975)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1976)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1977)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1978)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1979)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1980)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1981)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1982)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1983)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1984)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1985)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1986)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1987)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1988)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1989)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1990)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1991)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1992)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1993)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1994)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1995)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1996)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1997)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1998)

Iowa bird life - Iowa Ornithologists' Union. (Iowa Ornithologists' Union, 1999)