History books have users as we as readers. Though my dearest wish is for this book to attract cover-to-cover readership, I also wish its contents to be useful to those who may wish to take it off the shelf in search of special information or a certain fact about the history of NACA Langley laboratory. The appendixes permit the dissemination of a wealth of useful information which cannot be included gracefully in the text. The appendix user should note that similar material is to be found in the appendixes of Alex Roland's Model Research.

The following abbreviations have been used in the appendixes:

ACR	Advance Confidential Report
AERL	Aircraft Engine Research Laboratory (Cleveland, Ohio)
AR	Annual Report of the NACA
BuAer	U.S. Nay Bureau of Aeronautics
HSFS	High-Speed Flight Station (Muroc, California)
LaRC	Langley Research Center
TM, TN, TR	Technical Memorandum, Technical Note, Technical Report
USAAC	U.S. Arm Air Corps
WR	Wartime Report

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