A few months ago I submitted a link to Jean Meeus's Astronomical Algorithms (now available at <a href="https://shopatsky.com/products/astronomical-algorithms-2nd-edition" rel="nofollow">https://shopatsky.com/products/astronomical-algorithms-2nd-e...</a>) without realizing it was no longer available for purchase. Now the Willmann-Bell catalog is returning through Sky and Telescope.