Search Results       Your search for [author]Heady, Howard H. returned 1 record.           Assaying ores, concentrates, and bullion : revision of information circular 7695. by Heady, Howard H.; [Washington]: U.S. Bureau of Mines, 1976. Subject: Ore -- United States -- Analysis; Precious metals -- United States -- Analysis; Testing laboratories -- United States.          Add to Book Cart Relevance: 19.85%