> As for coloration and latitude/altitude changes, might try Alpatov for
> some reading, or even old Bergmann and his famous Rule!
I'm not familiar with thes people, and I doubt their work is easy for me to
find. Could you kindly outline where/when each wrote, whether their work has
been corroborated by later writers, and, in a nutshell, what they found?
Thanks.
allen
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