Aircraft heaters. Investigation of aircraft heaters: 21, Measured and predicted performance of flattened-tube type crossflow exhaust gas and air heat exchanger [with list of references]; by L. M. K. Boelter, A. G. Guibert, J. M. Rademacher, F. E. Romie, V. D. Sanders, and L. J. B. Sloggy.

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