I didn't look at them all, but all of the GA Russell free cookbooks from today that I looked at say:
This book was converted from its physical edition to the digital format by a community of volunteers. You may find it for free on the web. Purchase of the Kindle edition includes wireless delivery.
This usually means this was converted from a public domain ebook at Project Gutenberg, and so it's probably always free at Amazon, and if not, it's free at Project Gutenberg.
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