Very nice 1000 page book - has formulae and calculated (to 10 digits + in transcendentals and connstants).<br><br>Alloows one to use a calculator or slide rule (!!) in lieu of a computer if doing field remote calcs, or the power dies! Also useful to add iterations into spreadsheets for determining values. A must-have for those needing an excellent reference with tables, calcs, formulae, and more. Highly recommended!