American Manganese Producers Association
![Address[es given at the] third annual convention, Washington, D.C., Nov. 10-[11] 1930](https://s3.amazonaws.com/readfeedstatic/book_covers/thumbnails/rf-placeholder.png)
Address[es given at the] third annual convention, Washington, D.C., Nov. 10-[11] 1930- Before the Treasury Department of the United States in the matter of the petition of the American Manganese Producers Association for an embargo against the importation of Russian manganese
- Official statements of senators, congressmen, and government officials on manganese, essential to national defense and prosperity