A good resource for researching treasury bonds is http://etfdb.com/etfdb-category/government-bonds/ they have lots of information about different types of treasury bonds.
The symbol for a 30-year Treasury bond is TLT. TLT is an exchange-traded fund (ETF) that tracks the performance of US Treasury securities with 20 or more years to maturity. Investors often use TLT as a way to gain exposure to long-term Treasury bonds in their investment portfolios.
The average annual dividend yield for a bond dividend ETF is the average percentage of dividends paid out by the ETF's bond holdings to investors each year.
The symbol for Vanguard Total International Bond ETF in NASDAQ is: BNDX.
The symbol for iShares Core GNMA Bond ETF in NASDAQ is: GNMA.
The guaranteed return of an ETF is not fixed or guaranteed like a bond. It can fluctuate based on the performance of the underlying assets in the ETF.
The symbol for Vanguard Emerging Markets Government Bond ETF in NASDAQ is: VWOB.
The symbol for Vanguard Intermediate -Term Government Bond ETF in NASDAQ is: VGIT.
The symbol for Vanguard Intermediate-Term Corporate Bond ETF in NASDAQ is: VCIT.
The symbol for Vanguard Long-Term Corporate Bond ETF in NASDAQ is: VCLT.
The symbol for Vanguard Long-Term Government Bond ETF in NASDAQ is: VGLT.
The symbol for Vanguard Short-Term Corporate Bond ETF in NASDAQ is: VCSH.
As of July 2014, the market cap for iShares Core GNMA Bond ETF (GNMA) is $34,846,000.00.