# Create the bit vectors
my $bv1 = Bit::Vector->new(50);
my $bv2 = Bit::Vector->new(50);
  ...

# Keep associated bv's together
my @source1 :shared = ($bv1a,$bv2a,...,$bv85000a,...$bv25000000a);
my @source2 :shared = ($bv1b,$bv2b,...,$bv85000b);
  ...

# Add these arrays to a single, global array
my @sources :shared = (\@source1, \@source2, ...);