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MCELROY (William D) & SWANSON (Carl P), . (1968). Foundations of biology. N J: Prentice Hall.
MCELROY (William D) & SWANSON (Carl P), . 1968. Foundations of biology. N J: Prentice Hall.
MCELROY (William D) & SWANSON (Carl P), . Foundations of biology. N J: Prentice Hall. 1968.