TITLE: History of connections
QUESTION [17 upvotes]: Are there any good detailed historical sources about development of connections on vector/principal bundles over the last 100 years?
The best source I am aware of is Michael Spivak's 5 volume opus, but this is not detailed enough for the project I have in mind (I am intending to set this as a topics essay for my first year graduate differential geometry class, and I want to make sure I know enough myself first!).

REPLY [2 votes]: Try searching "A Historical Overview of Connections in Geometry". This is a wonderfully accurate account of the history of connections.