“Because it was discovered to be inaccurate,” she finally replied. “Remember, these maps were used by insurance underwriters to determine the risk of damage or complete destruction of a given building due to accidental fire or flood, in order to charge the landlords the right premium. Precision was of the utmost importance. Once the inaccuracy was discovered here, the eighth edition was rushed out, and most of the seventh editions were probably trashed, to prevent confusion.”
