U.S. R&D 1975-1998: A New Dataset
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资源简介：
This novel dataset covers 2805 companies with 8525 facilities, including location, reporting line within the organization, numbers of professional staff and technicians, and R&D fields over the years 1975-98. The dataset includes a match to the Compustat identifier, gvkey. Also included here are the original source files under license from the copyright owner.
创建时间：
2019-01-01
