This stamp isn't worth a lot. It is Scott Catalog #774. Issued as a in 1935. 73,610,650 were printed. There are 4 values for this stamp and they are:
New: 30 cents
Used: 20 cents
Face: 3 cents
Dealer: 2 cents
(Scott Specialized Catalog of US Stamps 2001, page 87)
Boulder Dam.
Boulder dam was originaly named Hoover Dam.
It was called Boulder Dam.
Boulder Dam is now called Hoover Dam. It is located on the Colorado River between Arizona and Nevada.
A nickname for the Hoover Dam is Boulder Dam.
boulder dam
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Boulder Dam.
Boulder Dam.
It is called Hoover Dam.
Hoover dam (Boulder) was named in honor of Pres. Herbert W. Hoover.
Hoover Dam was originally called Boulder Dam.