how many b52 were made
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how many b52s were built
when was the b52 made
what year was the b52 made
how many b52 does the us have
how many b-52 were built
b52 bomber how many
when was the b52 introduced
history of the b52
what year did the b52 come out
who made the b 52
is the b52 still in production
when was the b52 released
total number of b-52 built
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