This map from a 2012 report titled Print Management at “Mega-scale”: A Regional Perspective on Print Book Collections in North America indirectly relates to books and journals in the Romance languages but I thought it might be educational to share since so much of our daily cooperative collection building decisions fit into this framework. It visualizes how shared research library collections coincide with the emergence of mega-regions, or geographical regions defined on the basis of economic integration and other forms of interdependence. For those of us who work in the library, it reinforces the role that research libraries like UCB, UCD, UCSC and Stanford play at the national level and how paramount it is for us to continue to strive together for robust and comprehensive regional collections so that we can support the current and future research and teaching needs at one another’s campuses and beyond.