Bob Gardner has just finished a fabulous CD covering a ton of material that isn't available in any books that I've come across, and I've been looking for a long time. I wish it was practical for him to publish it in book format, but my understanding is that there are so many photographs in it that publishing it in its present form would be too expensive to be practical. Here's the link for information on it and how to order it.
There were two books that I do know of, both of which are now out of print, but Bob's CD contains far more information that both of them, and one of them "Thrusting Forward" didn't have much on the early props and dealt more with the history of Hamilton Standard.
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