The International Standard Atmosphere and the 1976 US Standard Atmosphere agree up to 32 kilometres. The latter standard is included in the references to the Wikipedia entry on ISA. Working with altitudes greater than this will require taking account of changes to R (gas constant for air). At sufficiently high Mach numbers account may need to be taken of changes to gamma.
Use the Barre de Saint-Venant equation for Mach numbers below 1, and for Mach 1 and above use the Rayleigh supersonic equation. Both are derived in Anderson referenced by PBL above, and are elsewhere located on the Internet. Build your tables for Mach -v- CAS. While EAS is a physically meaningless quantity the step in determining it from TAS is straight forward.
The equations you'll need can be found in NACA Report 837. Aiken, William S, Jr. (1946.)
NACA Report 837: Standard nomenclature for airspeeds with tables and charts for use in calculation of airspeed. Langley, VA.
NACA UK Mirror report description page