Cookbooks in PDF Format

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Not sure if this is the correct place for this posting..? I was under the impression that Cookbooks #1, #2, #3 etc were going to be listed in a pdf book format. I did a search, managed to find Cookbooks #1 and #2 in pdf format that I was able to download but that was as far as I got. Was there anything done in pdf format for the later editions or is it too early yet to be created..?

Helmuth