Where can i find information on the discovery of geological glacial and interglacial periods?

i need to find information on the history of when these were discovered.Where can i find information on the discovery of geological glacial and interglacial periods?This is harder than it looks. I think the main person who described ice processes was Louis Agassiz: Do a search on his name. Try the links below which may help.Where can i find information on the discovery of geological glacial and interglacial periods?look it up on googly and go to wick and look there and they well have links!!