GeoMax 4-1/2" x 7-1/4" Engineer's Field Book
ENGINEERS FIELD BOOK (4 1/2 X 7 1/4 IN)
Durable, weatherproof field books Left page has blue horizontal and red vertical lines. The right page has 10 x 10 blue lines and a red vertical center line; inch lines heavy. Helpful tables and formula for solving right angles, curves. Book measures 4-1/2" x7-1/4".