How are exemplary theses in mathematics organized?

I have to write a thesis to complete my BSc (note: some degree of original research is not compulsory, but strictly recommended), but I realized that I don't really know how a thesis looks like (note: my area is mathematics). I have enough time to have a look at some theses before starting writing down mine, however, to get an idea of what a thesis involves and what are the alternative modes of presentation.

So I'd like you to give some links to (math) theses freely available online that can be considered exemplary.

Remark: It would be very helpful of you to specify why you find them exemplary. Also, note that I'm not much interested in theses that contain outstanding theorems, but rather in theses that are well-presented and from which I can learn how to handle the "details" (how they are formatted and organized (including aknowledgment section, index, table of content, bibliography); how many chapters there are and how the content is distributed; how the objectives are presented and how the significance of the thesis is justified; how extensive the literature review is; how many new results are presented, etc.).