Actually, I think you're referring to elevation above sea level, as MSL is what it is.
USGS contour maps are a probably the best reference. For general info, you could try National Geoggraphic Society elevation maps - not as exact a survey maps but close.
I think the USGS web site is one of the few in the Dept. of the Interior that is not shut down by court order right now. The Indian (Native American) Royalty case has screwed up stuff completely unrelated.
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