Temperature of the Earth's inner core

I've been trying for a couple days now to find out what the
temperature of the earth's inner core was estimated to be over the
past century and I was hoping that one of you might shine a bit of
light on the subject. The oldest estimate I've been able to find so
far was from 1969 and that was 3,000-5000 degrees celsius. While this
does differ from the estimates of today, it's only a single source (a
science textbook) and I was hoping I could find more. Ideally, I'd
like to find estimates from anywhere around the 1930's all the way
through the 1950's.

If anyone happens to know about the history of the estimated pressure
at the earth's center, that would be greatly appreciated as well but
I'm under the impression right now that that has been much more
constant.
.

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