I have both of them and have had previously released issues as well. They are both very well done, but also very dated. The publication market has cooled significantly, but I still enjoy publications / programs very much and I think they are very undervalued. The newest version of each is worth picking up if you like publications. Both have very good info for cover subjects, articles, etc. even if you are an advanced collector. Both Regli and Crestohl / Alexander are experts in the field of publications. I have learned a lot from both books / guides.
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