" 20 LB mead bond" est une indication de marque / grammage papier. La conversion est compliquée, comme l'explique le document cité, mais d'après la conversion disponible ici, (http://www.paper-paper.com/weight.html)
Bond = 17x22", soit 43,18x55,88 cm, 75,2 grammes, soit proche de notre 80 gr standard.

"The U.S. paper industry has managed to come up with a truly bizarre way of specifying the density of paper. Instead of providing you with the obvious quotient of mass per area (e.g., in grams per square meter, ounces per square yard, whatever), they specify the total mass M of a ream of N pages of some size X×Y. This means, you have to know four (!) values in order to understand how to calculate the (scalar) density of the paper. For example "20 lb paper" can mean that a ream of 500 pages in format 24×36 in has a total mass of 20 pounds. These ream sizes of 500 × 24 in × 36 in = 278.70912 m² are somewhat typical in newsprint applications but not universal, as 17×22 in, 25×38 in and other reference sheet sizes are used as well! With 453.59237 g/lb and 278.70912 m²/ream, we get roughly 1 lb/ream = 1.63 g/m² for this particular ream size. It is a big pain if you have to do these conversions yourself and you really should complain to paper suppliers who still do not manage to communicate the proper g/m² values (commonly called "grammage" in both English and French) for their products. "
http://amath.colorado.edu/documentation/iso-paper.html

"Bond paper
Definition: Especially suitable to electronic printing and use in office machines including copiers and desktop printers, bond paper is a strong, durable paper. Bond paper has a basic size of 17 inches by 22 inches and a basis weight of 13 to 25 lbs. It is characterized by erasability, good absorption, and rigidity. "
http://desktoppub.about.com/od/glossary/g/bondpaper.htm

Kudo by Hendiadys:

"papier écriture, papier à lettres, papier commercial
Explanation:
Bond (voir ci-dessus au choix), book (papier édition), cover (papier couverture), bristol (papier carton/carte de visite), newsprint (papier journal), TAG (papier étiquette) sont des formats bruts de papier américains (non rognés) exprimés en pouces.
Le bond fait 17x22", soit 43,18x55,88 cm, pour des grammages compris entre 49 et 151 g/m².
Réf. dico technique des industries graphiques

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Note added at 5 days (2006-08-30 07:29:49 GMT) Post-grading
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Papier bond ne se dit pas. On fait la conversion dans le grammage correspondant. Ex.: (20 lb bond to 110 lb cover) donne (80 g/m² à 300 g/m²). "
http://www.proz.com/kudoz/english_to_french/paper_paper_manu...

Mead

Un des plus grands fabricants de papier:
"The Mead Corporation is one of the world's largest manufacturers of paper (producing more than 1.7 million tons each year) pulp, and lumber. Each year Mead produces more than 1.5 million tons of paperboard and the company is an industry leader in coated paperboard, containerboard, and multiple packaging. Mead also distributes paper and packaging and is a leading maker and distributor of school supplies in the United States and Canada."
http://www.answers.com/topic/the-mead-corporation

reste un problème: une recherche sur le site de Linear portant sur "20 lb mead bond " donne des liens vers une série de PDF concernant leurs produits, mais les mots ne fifurent dans aucun des pdf.

je suppose que ça veut simplement dire : imprimé sur papier 80 gr ...

ps: tout ça pour ça ...