Recognizing the importance of computational science, Springer has made selected introductory chapters open access. You can find the introductory chapters on "Multiscale Modeling" and "High-Performance Computing" for free legally.
: A PDF version (approx. 25.7MB) of the handbook is available for download on VDOC.PUB .
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Take the pseudo-code from the handbook. Do not copy-paste; type it out manually. Translate the Fortran-style pseudo-code into Python (for learning) or C++ (for production). This is how you internalize algorithms like the Fast Fourier Transform (FFT) for electrostatics.