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Comoros
Scott number unknown
The virus on the top-left of this sheet is an HIV virus.
Chad
Information regarding these stamps can be found on the counterfeit stamp page.
El Salvador
Scott number unknown
Ghana
Scott numbers unknown
Ghana released this souvenir sheet in honor of President Bush's trip to Africa to promote American foreign policy on AIDS.
Macedonia
Scott RA146
Macedonia releases postal tax stamps annually. These are from two different issues this year, in December and March respectively.
Mali
Scott number unknown
An article on a Mali website stated that there are additional stamps in this series.
Mongolia
Scott number unknown
Papua New Guinea
Scott 1339 - 49
I am not sure what the Scott number are for the two souvenir sheets yet.
Sao Tome and Principe (St. Thomas)
Scott number unknown
I have the sneaking suspicion these stamps may not be legal, but at present I have no evidence to support my hunch.