All my knowledge in GIS is from practice, and of course, without theoretical knowledge sometimes it is not only very hard to know how to do some task, but also – what exactly I want to do. Now that I have dealt with some issues it is not as hard as it used to be at the beggining, but when looking at http://gis.stackexchange.com/ answers, it is obvious that there some space to improve.
So I have found some Lithuanian books on GIS. After reading each of them, I will try to summarize the info and put it here together with some English references if I’ll find them.
Another book I would love to get my hands on is GIS for Transportation as it is directly related to what I currently do.