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					Originally Posted by swarmee  N - Nineteenth Century cardsT - Twentieth Century cards
 V/C - Canadian cards
 E - Candy series cards
 W - Mostly cards issued in strips
 R - Gum cards (like Goudey)
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 Burdick did not use the N prefix for 19th century cards, simply referring to them by number. Burdick's N designation was used for Central and South American cards. The E designation was for Early candy and gum cards, as opposed to R for Recent candy and gum cards. The W category was not short for anything, just a catchall for what he called Album cards.