And I have seen some deficiencies on the web. In
the old days we didn't have calculators. But in those
days we had rather simple formulas for most everything
easily implemented in the POV parser. They were all in
the CRC books. Chemical Rubber Company.

    I have no idea what is in the CRC books today but
if you stop in a few used book stores you should be
able to find old ones for a few dollars. The older the
cheaper and math doesn't change.

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