Flashcards with QR codes for Allied Health Professions learning, which can be downloaded as a 3 MB file from the NES AHP site . Travel & Regional Brochures

While several guides match the "helpful guide" and "3 MB" criteria, the most prominent results relate to from the Scottish NHS and regional travel brochures .

A variety of language-specific mini-guides for the city of Brno are hosted on Go To Brno . Business & Technical Documents

Since your request is quite specific but doesn't name a topic, you might be looking for one of these:

A 3 MB guide to local villages near Saint-Jean-de-Luz, available from the Basque Country Tourist Office .