Additional Authors Are Irving Gringorten, Roy C. Gunter, Jr., And Bart J. Bok.

Additional Authors Are Knox McIlwain, Charles J. Hirsch, E. F. Flint, P. R. Adams, And R. I. Colin.

Additional Contributors Are Colin H. McIntosh, B. M. Dodson, Walter Hadel, G. G. McLintock, G. A. Patterson, N. Wyman Storer, Paul E. Stanley, William J. Catlett, Jr., Irving I. Gringorten, Charles H. Smiley, J. J. Green, And A. A. Chester.

Contributing Authors Include John W. Calvert, John C. Bellamy, John R. Poppen, William E. Molett, Vernon I. Weihe, Charles W. Thomas, Harvey Schwarz, And Samuel M. Burka.

Contributing Authors Include W. B. Klemperer, E. S. Quilter, Charles W. Handley, Alton Moore, Paul E. Wylie, And K. R. Greenaway.

Contributing Authors Include K. C. Maclure, R. H. Maynard, Fletcher G. Watson, Henrietta H. Swope, C. H. Smiley, And T. F. Hickerson.

Contributing Authors Include John Calvert, Ian Perry, Paul E. Wylie, Seymour Chapin, E. M. Grabbe, Pat M. Cianci, H. W. Dusinberre, H. H. Shufeldt, And G. D. Dunlap.

Contributing Authors Include Douglas H. Ewing, Walter Hadel, Robert Katz, John Knaul, And Harold Beck.

Contributing Authors Include G. L. Elliott, R. Weller, Alton Moody, W. J. Schart, David J. Haney, William Potter, Robert W. Beard, And Gabriel Ofiesh.

Contributing Authors Include John P. Snyder, R. S. Damon, Frederick Franklin, Charles Smiley, Vernon I. Weihe, Ph. A Gallas, John W. Calvert, And G. R. Tatum.

Contributing Authors Include Roland E. Barnaby, Jr. Hans Christian Freiesleben, Fred Franklin, Robert Sullivan, Milton Abramowitz, Dickson Call, J. C. Mathews, And Alton B. Moody.

Additional Authors Are J. A. Fleming, D. F. Folland, Paul E. Wylie, G. F. Jacobsen, Alton B. Moody, R. A. Tuttle.

Contributing Authors Include Otto Struve, John Langston, H. W. Dusinberre, Edwin Beito, Samuel Herrick, L. F. Banks, And E. S. Quilter.

Additional Contributors Are B. M. Dodson, Walter Hadel, G. G. McLintock, G. A. Patterson, R. W. Ravenhill, R. B. Michell, Ivan A. Greenwood, P. V. H. Weems, Mary R. Hunt, Norman P. Hays, John E. Knaul And J. A. Pierce.

Contributing Authors Include Samuel Herrick, John C. Bellamy, Charles DeVore, Walter Wrigley, And G. A. Long, Jr.

Illustrated By Florence E. Wharton. Contributing Authors Include Samuel Herrick, Edward T. Bolton, Austin Phelps, S. A. Goudsmit And Robert S. Richardson.

Contributing Authors Include Edwin A. Beito, Walter Zimmerman, Charles T. Dozier, D. E. McKay, Marvin Greenberg, And Paul Miller.

Additional Authors Are G. G. McLintock, Alton B. Moody, Julien M. Christensen, Telfair Knight, Vincent J. Schaefer, Paul E. Wylie, B. B. Talley, L. M. Sherer, Henrietta H. Swope And John F. Heard.

Additional Authors Are Virginia Withington, R. F. Farwell, Elliott B. Roberts, James L. Anast, Daniel Lineham, Ramon O. Williams, And Vernon I. Weihe.

Additional Contributors Are Colin H. McIntosh, B. M. Dodson, Walter Hadel, G. G. McLintock, G. A. Patterson, B. W. Sitterly, J. A. Pierce, Neal Harlow, William H. Holman, III, Ralph F. Haupt, Vernon I. Weihe, Alton B. Moody, And Clay V. Ferguson.

Contributing Authors Include John P. Snyder, R. S. Damon, Frederick Franklin, And Many Others.

Contributing Authors Include Paul Rosenberg, Charles H. Smiley, Robert H. Randall, Jr., Randolph E. Tyrrel, P. V. H. Weems, Eric J. Isbister, John W. Busby, Ralph F. Clark, W. F. Griswold, George W. Petrie, Roy W. M. Graham, C. W. Davis, A. N. Black, And F. Y. Craig.

Additional Contributors Are Colin H. McIntosh, B. M. Dodson, Walter Hadel, G. G. McLintock, G. A. Patterson, Fred A. Gross, British Air Ministry, Trevor A. Hoy, George W. Mixter, L. J. Comrie, And Samuel Herrick.