I realize the hardcovers themselves are quite small compared to the paperbacks, but I've read a couple of them before from a library and didn't have any issue like some reviewers have had.
have them all --read them all through childhood which may have lead to my unfortunate 'knickers and trenchcoat' phase. Available in 3 volume sets via Amazon.com http://www.amazon.com/Adventures-Tintin-Collectors-Gift-Set/dp/0316006688/ref=sr_1_1?ie=UTF8&s=books&qid=1267913793&sr=8-1
Yep, I remember reading those! This is the set I'm talking about: https://www.amazon.com/Adventures-Tintin-Collectors-Gift-Set/dp/0316006688/ref=sr_1_fkmr0_1?ie=UTF8&qid=1468812340&sr=8-1-fkmr0&keywords=tintin+slipcase+set