Grammage are the same weight paper having different cut size. However, a sheet of common copy paper that has a basis weight of does not have the same mass as the same size sheet of coarse paper (newsprint). In the former case, the standard ream is 500 sheets of paper, and in the latter, 500 sheets of paper. Here are some basic ream sizes for various types of paper. Units are inches except where noted. Sheets can be cut into four sheets, a standard for business stationery known conventionally as "letter sized paper". So, the ream became commonly used. The book-paper
Dwight Ream in 1954. Dwight Ream Dwight Thoburn Ream (March 23, 1892 – November 20, 1954) was an American football and basketball coach and college athletics administrator. He was the 16th head football coach at Washburn University in Topeka, Kansas, serving for two seasons, from 1920 to 1921, and compiling a record of 8–7–4. In the 1920 game against Kansas Normal under coach Homer Woodson Hargiss, Kansas Normal fullback Jack Reeves sustained a neck injury that resulted in his death. Ream was also the head basketball coach at Washburn in 1921–22, tallying a mark of 8–9. Ream died after a long illness