1. Bureau of Labor Statistics. (2021). QCEW location quotient details (Bureau of Labor Statistics, Quarterly Census of Employment and Wages). Retrieved from https://www.bls.gov/cew/about-data/location-quotients-explained.htm
2. Bureau of Labor Statistics. (2022). Private, NAICS 332117 powder metallurgy part manufacturing, all counties in Pennsylvania 2021 fourth quarter, all establishment sizes. (Bureau of Labor Statistics, Quarterly Census of Employment and Wages). Retrieved from https://data.bls.gov/cew/apps/table_maker/v4/table_maker.htm#type=2&st=42&year=2021&qtr=4&own=5&ind=332117&supp=1
3. Bureau of the Census. (2022). Frequently asked questions: What is an establishment? (Bureau of the Census, North American Industry Classification System). Retrieved from https://www.census.gov/naics/#q2
4. Fiodin, A., & Kianan, B. (2021). Tesla teardown: Identifying potential uses for PM in electric vehicle transmissions. Powder Metallurgy Review, 10(4), 45–52. https://www.pm-review.com/wp-content/uploads/2021/11/PM-Review-Winter-2021.pdf