"Exponential Integral" paper request

[amahaminer]

I need these two papers please:

Nisle, Robert G.: “How to Use the Exponential Integral”, Pet.Eng. (Aug., 1956) B-171.

Tables of, Sine, Cosine and Exponential Integrals, Vol. 1 and II,. Federal works Agency, WPA. superintendent of Documents,Washington, D.C.

[vinomarky]

If you wanted equations, you can get them in a few places;

Chapter 5 of the following link will give exhaustive details

[link Point to another website Only the registered members can access]
Simple first degree Ei can be calculated with following Excel VBA code;

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And another reference complete with Taylor expansion approximations

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