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I just noticed the copy I ordered is from 1980. Is this any good? There's also one from 1974 which I might get.
As for the Amazon books, alas Amazon does not ship to the Philippines. I'd need an intermediary to ship it here. Will check out the al libris site.
Thanks guys!
Regarding your tanks, is the extra port pre-valve (like a burst disc) or post-valve? I believe many were pre-valve, which made them unusable for a pressure gauge.
Pre-valve works fine with pressure gauges, but it always has to be attached, which dive shops frown upon for some reason.