Abstract

A part of the celebration of the Society's Fiftieth Anniversary has been the presentation of historical papers at its 99th and 100th Technical Conferences. Following in this issue of the Journal arc several of the contributions. Others were published earlier in the year and several more will appear when the authors and editors have them complete with archival illustrations. The Society is especially indebted to these authors and many others who have given extended and diligent help to check data and find illustrations.

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