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Bristol board is made in Bristol, England. Oak Tag is American, probably the same, or very similar, but cannot be called Bristol board.
They had 3 daughters,
Pepper, Shaniqua, and Bristol. Bristol (the eldest, married at 13) so she married Samuel Board, therefore Bristol was known as Bristol Board.
Bristol board is a strong, smooth support (paper) used most often by illustrators.
18x24
think so