Your request is so vague it cannot be satisfied. Are you wanting hardware information or software information or both? For hardware, are you wanting z11, z10, z9, or other hardware data? For software, are you wanting tutorials, manuals, specification sheets, or what?
A typical mainframe installation will usually have somewhere between 1,000 and 2,000 manuals for hardware and software, with the page count usually upwards of 2 million pages. Just asking for "mainframe materials" shows a complete and total lack of understanding of the mainframe and its history.
Furthermore, many manuals are copyrighted and cannot be posted nor linked to nor provided to you -- you have to get them yourself.
I strongly recommend you go to
http://www.s390.ibm.com and spend a few weeks reading before attempting to post another question -- at least then you are more likely to ask something that can actually be answered!