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Maryland. Department of Employment Security
Nonagricultural employment manufacturing hours and earnings, 1957 S[tandard] I[ndustrial] C[lassification]
![Nonagricultural employment manufacturing hours and earnings, 1957 S[tandard] I[ndustrial] C[lassification]](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)