[United States National Bureau of Standards Ruler]

Sizes

Square
75 X 75
Thumbnail
120 X 25
Small
300 X 63
Medium
700 X 147
Large
930 X 195
Extra Large
1500 X 315

United States. National Bureau of Standards. [United States National Bureau of Standards Ruler]. Washington D.C.. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc123540/. Accessed October 22, 2014.