"Bristol A paper with a basis weight of 90# -120# but generally not as heavy as cover. Bristol papers are great for folders, index cards and covers and postcards.
(...)
Cover : Also called cardstock. A high-quality, heavyweight coated or uncoated paper. Great for greeting cards, business cards, magazine and annual-report covers folders."
"card•stock
Pronunciation: (kärd'stok"), [key]
—n.
paper stock stiff enough for the printing of business cards and similar uses."
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The translation workplace 
