Collier's encyclopedia, with bibliography and index / William D. Halsey, editorial director, Louis Shores, editor in chief ; Robert H. Blackburn, consultant for Canada, Sir Frank Francis, consultant for Great Britain.
Collier's encyclopedia, with bibliography and index / William D. Halsey, editorial director, Louis Shores, editor in chief ; Robert H. Blackburn, consultant for Canada, Sir Frank Francis, consultant for Great Britain.