[NBER Working Paper No. 27021] The Subways Seeded the Massive Coronavirus Epidemic in New York City https://www.nber.org/papers/w27021.pdf https://www.nber.org/

[NBER Working Paper No. 27021] The Subways Seeded the Massive Coronavirus Epidemic in New York City https://www.nber.org/papers/w27021.pdf https://www.nber.org/papers/w27021.pdf