I have "Mastering", but truth to tell, the book I pick up and use more often is the Pepin/Child book. More general, but more accessible. I have easily a couple hundred cookbooks upstairs, then a sideboard in the dining room (it is an old house, the stairs between the two are those between a maid's room and what was probably once the kitchen, the sideboard put in during the past century). The sideboard has "Joy" on it always, then anything from a few to a dozen cookbooks that I most recently used. The Child/Pepin book is there most of all the other cookbooks/magazines.