1. USGS National Transportation Dataset
Shapefiles for each state’s roads, airports, trails, and railroads.
Related
Topics
More from NBER
In addition to working papers, the NBER disseminates affiliates’ latest findings through a range of free periodicals — the NBER Reporter, the NBER Digest, the Bulletin on Retirement and Disability, the Bulletin on Health, and the Bulletin on Entrepreneurship — as well as online conference reports, video lectures, and interviews.
Alan J. Auerbach, the Robert D. Birch Professor of Economics and Law at the University of California, Berkeley, and...
Long-time NBER research associates Joshua Angrist, David Card, and Guido Imbens have been awarded the 2021 Nobel Prize in Economic Sciences in recognition of...
The credible estimation of causal effects is a central task of applied econometrics. Two tools for this purpose that...