(1940). Public Aids to Transportation; Volume I, General Comparative Analysis, and Public Aids to Scheduled Air Transportation; Part I, General Comparative Analyses; Part II, Public Aids to Scheduled Air Transportation. [s.n.].
Chicago Style (17th ed.) CitationPublic Aids to Transportation; Volume I, General Comparative Analysis, and Public Aids to Scheduled Air Transportation; Part I, General Comparative Analyses; Part II, Public Aids to Scheduled Air Transportation. [Washington]: [s.n.], 1940.
MLA (9th ed.) CitationPublic Aids to Transportation; Volume I, General Comparative Analysis, and Public Aids to Scheduled Air Transportation; Part I, General Comparative Analyses; Part II, Public Aids to Scheduled Air Transportation. [s.n.], 1940.
Warning: These citations may not always be 100% accurate.