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https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1971/8068491 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1972/8068528 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1973/8068572 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1974/8068609 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1975/8068646 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1976/8068686 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1977/8068728 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1978/8068765 https://nnp.washu.edu/Documents/Detail/pcns-bulletins-january-december-1979/8068814