| Link |
Subject |
||
| Link | Jamaican Obliterators | Nicholson, LCC | 1949 |
| Link | BWI Philatelist Articles | incl Gibson, Russell | 1950s |
| Link | BWISC Bulletin Articles | various | 1950s to 2000s |
| Link | Listing of obliterators | Potter, Ian | 1996 |
| Link | Obliterator Scarcity Table (updated with Hamilton new discoveries) |
Topaz, Bob (BCPSG) Hamilton, M |
1967 2009 |
| Link | Obliterator Scarcity Table | Ian Woodward | 2009 |
| Link | Obliterator Examples | Ian Woodward | 2009 |
Michael Hamilton (http://michael-hamilton.com/home.html) has probably the most comprehensive stock of numeral obliterators available for retail sale.