for my $s ($parsed_document->worksheets() ) { 
  $s->{MinRow}=0;
  $s->{MinCol}=0;
  # $s->{MaxCol}=100;   (Edit: Not needed)
  # $s->{MaxRow}=7000;  (Edit: Not needed)
  ...
  my $c = $s->get_cell($row, $column);
  ...