Ha! Believe it or not, Joy of Cooking is my #1 recommendation for cooks at any level. Truly the "Swiss Army knife" of cookbooks targeted at the home cook. It's been around, I don't know, just about forever? A true all-purpose classic that everyone should have, and use.
There was also an even older cookbook that found its way into various kitchens that I've worked in, which similarly focuses on American cooking: The Fannie Farmer Cookbook. I confess, though, that I've not explored that one very much.
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