An APN is 16 characters, begins with 0 or 4, and is in the format: 3 numbers | space OR capital letter | space | 4 numbers | space | 3 numbers | space | 2 numbers. EXAMPLES: 077E 1596 024 02, 413 0003 002 00 (2 spaces after 413). You may leave off the beginning or end or an APN (don't use a *); searching for 77b 0900 will find documents for parcels in Book 77B, Page 900.