Letter (paper size) "official" "Government Letter" size, , was used in government, while paper was standard in most other offices. In the U.S., paper density is usually measured in "pounds per ream" (of 500 sheets). Typical Letter paper has a basis weight of paper of – the weight of 500 sheets (a ream) of paper at and at 50% humidity. One ream of 20-pound Letter-sized paper weighs , and a single Letter-sized sheet of 20-pound paper weighs , which is equivalent to 75.19 g/m. Some metric information is typically included on American ream packaging. For example, 20-pound paper is also labeled as 75
Canada 2c Large Queen on laid paper Canada 2c Large Queen on laid paper The 2¢ Large Queen on laid paper is the rarest postage stamp of Canada. Printed in 1868, it was not discovered until 1925, and so far only three have been found, all used. Many more could exist as at least one sheet must have been printed, and possibly many sheets; however, they may all have been destroyed, or lie unrecognised in stamp collections or on cover. The Large Queens were the first issue by the Dominion of Canada; they are so-called to distinguish them from the 1870 issues (the "Small Queens") which are