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by Bird, R. Byron; Armstrong, Robert C.; Hassager, Ole
by DeVita, Philip R.; Armstrong, James D.
by Armstrong, Billie R.
by George Armstrong Kelly , Preface by Stephen R. Graubard
by Armstrong, R.
by Watson, Thomas; Armstrong, R.
by Armstrong, Thomas R.
by Perry, Charles John; Armstrong, R. A.; Carpenter, J. Estlin