The Calvert Group of Bethesda, Md., has added a new screen on its "Know What You Own" web site mechanism, which gives investors the ability to find out if a mutual fund holds stock in companies in the firearms industry, according to a company announcement.

The screening device is available on the home page of the Calvert website. Investors can type in the name of a mutual fund and screen for firearms firms as well as for those that sell tobacco-related products. The site also lists the top holdings in funds.

To coincide with the new screening capability, Calvert has added a new "issue brief" on the website on the topic of firearms, which provides information on the sales of guns in the U.S. Other briefs on tobacco, the environment and human rights were added last year.

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