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By Tortora, Gerard J.
By Tortora, Gerard J., Derrickson, Bryan H.
By Tortora
By Tortora, Gerard J., Grabowski, Sandra R.
By Tortora, Gerard J., etc.
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By Tortora, Grabowski
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By Gerard J. Tortora, Tortora, Gerard J.
By Gerard J. Tortora;Bryan Derrickson, Tortora
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By Tortora, Gerard J., Anagnostakos, Nicholas P.
By Tortora, Gerard J., Anagnostakos, Nicholas P., Grabowski, Sandra Reynolds
By Tortora, Gerard J, Anagnostakos, Nicholas P, Gerard J., Nicholas P.