Series and Classes/Contracts Information:
| Existing | |||
| Status | Name | Ticker Symbol | |
| CIK 0000746458 | |||
| Series S000006471 | HIGH-YIELD MUNICIPAL FUND | ||
| Class/Contract C000017685 | INVESTOR CLASS | ABHYX | |
| Class/Contract C000017686 | A CLASS | AYMAX | |
| Class/Contract C000017688 | C CLASS | AYMCX | |
| Class/Contract C000088012 | INSTITUTIONAL CLASS | AYMIX | |
| Status | Name | Ticker Symbol | |
| CIK 0000746458 | |||
| Series S000006472 | INTERMEDIATE-TERM TAX-FREE BOND FUND | ||
| Class/Contract C000017689 | INVESTOR CLASS | TWTIX | |
| Class/Contract C000017691 | INSTITUTIONAL CLASS | AXBIX | |
| Class/Contract C000088013 | A CLASS | TWWOX | |
| Class/Contract C000088014 | C CLASS | TWTCX | |
| Status | Name | Ticker Symbol | |
| CIK 0000746458 | |||
| Series S000006473 | TAX-FREE MONEY MARKET FUND | ||
| Class/Contract C000017692 | INVESTOR CLASS | BNTXX | |
| Status | Name | Ticker Symbol | |
| CIK 0000746458 | |||
| Series S000006474 | LONG-TERM TAX-FREE FUND | ||
| Class/Contract C000017693 | INVESTOR CLASS | ACLVX | |
| Class/Contract C000017694 | INSTITUTIONAL CLASS | ACLSX | |
| Class/Contract C000017695 | A CLASS | MMBAX | |
| Class/Contract C000017697 | C CLASS | ACTCX | |
IRS No.: 776009794 | Fiscal Year End: 0531
Type: N-CSRS | Act: 40 | File No.: 811-04025 | Film No.: 161367308
