What is a blue book for obtaining a non-O visa based on marriage to a Thai?

To obtain a non-O visa in Savannakhet based on your marriage to a Thai citizen, you are required to present the 'tabien baan', which is a Thai house registration book. In your case, since your wife's name is listed in an old brown, battered tabien baan in Bueng Kan, you can use a copy of that listing as proof of your marriage and residence for the visa application.