Libraries do not always contain adequate information to deal with issues. While your research is of vital importance to you, you are not likely to be a top priority for a diplomat. A good suggestion is to request copies of any statements or policy papers on your topic. The more specific you can be the easier it is for the official to put relevant information together and get your request out of the in-basket and en route to you. If possible, type the letter in full business letter format on a school letterhead.
Embassies are generally quite good about sending material back.
Last year the University of Manitoba Model United Nations student group wrote away to at least 60 embassies for MUN material and country information. Not all of the countries responded but most of them sent a reply. Scadinavian countries in particular were generous and mailed very specific and current country information. On the whole, it's definitely worth the effort of putting together a letter and mailing it.