Field Book is a Notebook and Reference Book in One
High visibility yellow hard cover Engineer's Field Books have 80 pages. These Books have formulas for solving right angles and curves and tables for minutes in decimals of a degree; inches in decimals of a foot.
Field Book—Left page: Blue horizontal lines; red vertical lines. Right page: 4 x 4 blue lines, red vertical center lines. 4-1/2"W x 7-1/4"L.