A practical grammar of the English language : in which the principles established by Lindley Murray, are inculcated, and the theory of modes clearly illustrated by diagrams, representing the number of tenses in each mode, their signs and the manner in which they are formed /

Williamson,

A theory of wing-propulsion combinations in slow flight.

"Project No. 9-38-01-00 Task 902. Contract No. DA 44177-TC-439. U. S. Army Transportation Research and Development Command, Transportation Corps, Fort Eustis, Virginia."