Copyvio/Plagiarism check - all good. I reviewed matches above 5% on Earwig's Copyvio Detector and the only matches were titles etc.
Images - Image used is appropriate and appears to be legitimately public domain.
Early life
"Nerney received degrees from Cornell University in 1902 and,[2] three years later," - I'd suggest moving the cite, to something like "Nerney received degrees from Cornell University in 1902,[2] and, three years later," as source 2 is supporting the 1902 not the "and"; or just move the cite next to 3 and 4, maybe employing a WP:CITEBUNDLE.
moved as per the first suggestion
I'm not sure how long a source can be before page refs should be provided, so I'll say optionally you could add the page ref (p.83) for the Hansen source.
Oh yeah, I should. Added. I saw a discussion on WT:FAC that >10 is a pretty good guideline
Although Rudwick and Meier are both wikilinked, you could consider a brief introduction for them, something like "In 1967, historians Elliott Rudwick and August Meier ..."
Done
"She personally traveled around the country" - I don't have access to the source, is there any more detail available, e.g. something that helps quantify this?
Unfortunately, no
I note that MOS:PEOPLANG says "there is no consensus against what is sometimes perceived as inconsistency in the same article (Black but white)"
I've used the style I've seen increasingly common lately but am not wedded to it.
Thomas Edison
"At 334 pages, Nerney wrote it because she did not think an adequate biography of Edison had been written." - doesn't quite read right to me.
It's, I think a, consequence of over-eager paraphrasing. Rephrased
Add a comma after "Nerney had interviewed Edison for the book", or do something else to meet MOS:CITEPUNCT for ref 28.
Comma added
Breadth and depth are appropriate, based on what I've seen in sources. I couldn't access all sources used, but did some spot checks on those I could and found no issues. NPOV maintained.