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.

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.

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.

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 J. H. Dellinger, Charles H. Smiley, Horace R. Byers, And E. S. Quilter.

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

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.

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

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.

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

Contributing Authors Include Gordon G. McLintock, Harold C. Stuart, Jack Taylor, M. C. Young, D. M. Harvey, G. P. Disosway, Gordon Gray, Lewis A. Pick, F. A. Heileman, And Many Others.

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

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.