old time travel series - time machine passes 3 civilizations

concerned.newfie

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Nov 15, 2012
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Wondering if anyone might remember a very old time travel series, a possible professor at a university on east coast USA has a time travel machine materialize infront of him. He shoots forward just as our civilization dies, then past 2 more and arrives for the rise of a 4th civilization based in great lakes and eastern USA.

Apparently its possibly the last attempt as each one before wiped out resources and theres not much left.

the possibly 4 books show how time travel falls into the hands of both factions and time wars then occur.

Would have to be mid 60s and no later then late 70s.
 

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