Wright, Paul; Pirie, Peter.
Edwards, Ernest P.; Butler, Edward Murrell.; O'Neill, John P.
William B. McGregor
Burke, Bernard; Volume 2 edited by Ashworth P. Burke
Huntington, E. B. (Elijah Baldwin)
Mentzel, O. F.; translated by H. J. Mandelbrote
Mudge, Isadore G.; Sears, M. E.
National Research Council
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