Where can I find a paper or reference that describes the timeline of measurements of the magnitude of the electron's electric charge.
For context, Millikan's oil drop experiment in 1908 determined the charge of the electron to be 1.59*10^(-19) C, which is lower than today's accepted value. Richard Feynman is quoted as saying, in 1974, that subsequent experimental attempts to measure the charge were biased by Millikan's initial value:
[...] It's interesting to look at the history of measurements of the charge of an electron, after Millikan. If you plot them as a function of time, you find that one is a little bit bigger than Millikan's, and the next one's a little bit bigger than that, and the next one's a little bit bigger than that, until finally they settle down to a number which is higher.
Why didn't they discover the new number was higher right away? It's a thing that scientists are ashamed of—this history—because it's apparent that people did things like this: When they got a number that was too high above Millikan's, they thought something must be wrong—and they would look for and find a reason why something might be wrong. When they got a number close to Millikan's value they didn't look so hard. And so they eliminated the numbers that were too far off, and did other things like that...
Is there a reference that shows the temporal evolution of the electron's charge values? The most I've found is a statement that the values did change, but not what those values were.