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Heitman, Charles. The Aero Club of America. 



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Helbig. Da Roma all' Adriatico. 



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Helbig, D. Helbig iiber die " Landung " der Fides in der Adria. 



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. Nuovo procedimento di produzione dell' idrogeno per I'aeronautica. 



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Hele-Shaw. See 7241. 



Hele-Shaw, H. S. Friction. The friction of solids. 



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Helice, Napoleon Bonaparte. See 4204. 



