Proceedings of the Iowa Academy of Science for 1954, 1955, 1957, 1958, 1959, 1960, 1061, 1963, 1964, 1965, 1966, 1967, 1968, 1969; volumes 61, 62, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76
Publisher: State of Iowa
Published: 1969-01-01