Take a look at this!Barrier ExaminationIt's a really old book, but it has this many entries about barriers!It's a really old book, but it has this many entries about barriers!I'm always impressed by how you manage to find something like that.Heheh!I don's go around used bookstores for nothing!TahahaWell, I actually found it by chance in the storage at my family home.It's so old that it took me a while to decipher......This book is full of interesting stuff!I've learned lots from it.
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