R. A. Millikan, "On the Elementary Electrical Charge and the Avogadro Constant", Phys. Rev. 2, 109 (1913)
10.1103/PhysRev.2.109
4.774e-10   1.592e-19   3e-22
Oil-drop

R. A. Millikan, "I. A New Determination of e, N, and Related Constants", The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science 34, 1 (1917) 
10.1080/14786440708635672
4.774e-10   1.592e-19   3.2e-22
Oil-drop

A. P. R. Wadlund, "Absolute X-Ray Wave-Length Measurements", Phys. Rev. 32, 841 (1928).
10.1103/PhysRev.32.841
4.774e-10   1.5924e-19  2.3e-22  
X-Ray

R. T. Birge, "Probable Values of the General Physical Constants", Rev. Mod. Phys. 1, 1 (1929).
10.1103/RevModPhys.1.1
4.770e-10   1.5911e-19  1.6e-22
Review

E. Bäcklin, "Eddington's Hypothesis and the Electronic Charge", Nature 123, 409 (1929).
https://www.nature.com/articles/123409a0.pdf
4.793e-10   1.59877e-19 4.8e-22
X-Ray

J. A. Bearden, "Absolute Wave-Lengths of the Copper and Chromium K-Series", Phys. Rev. 37, 1210 (1931).
10.1103/PhysRev.37.1210
4.806e-10   1.6031e-19  1e-22
X-Ray

E. Bäcklin, "The X-Ray Crystal Scale, the Absolute Scale and the Electronic Charge", Nature 135, 32 (1935).
https://www.nature.com/articles/135032a0.pdf
4.805e-10   1.6028e-19   8e-23
X-Ray

J. A. Bearden, "The Measurement of X-Ray Wavelengths by Large Ruled Gratings", Phys. Rev. 48, 385 (1935).
10.1103/PhysRev.48.385
4.8036e-10  1.6023e-19   1.7e-23
X-Ray

M. Söderman, "Absolute value of the X-Unit", Nature 135, 67 (1935)
https://www.nature.com/articles/135067a0
4.806e-10   1.603e-19  1e-22
X-Ray

G. Kellström, "Viscosity of Air and the Electronic Charge", Phys. Rev. 50, 190 (1936).
10.1103/PhysRev.50.190
4.818e-10   1.6071e-19  3.7e-22
Oil-drop

E. Bäcklin and H. Flemberg, "The Oil-Drop Method and the Electronic Charge", Nature 137, 655 (1936).
https://www.nature.com/articles/137655b0.pdf
4.752e-10   1.585e-19   2.7e-22
Oil-drop

R. T. Birge, "On the Values of Fundamental Atomic Constants", Phys. Rev. 52, 241 (1937).
10.1038/137187a0
4.8029e-10  1.6021e-19  1.7e-23
Review

R. T. Birge, "Interrelationships of e, h/e and e/m", Nature 137, 187 (1936).
https://www.nature.com/articles/137187a0
4.8029e-10  1.6021e-19  1.7e-23
X-Ray

von Friesen, "", Uppsala Univ. Årsskr. 1935:14, reported in H. R. Robinson, Rep. Prog. Phys. 4, 212 (1937).
-
4.796e-10   1.5998e-19  1.7e-22
Electron diffraction

H. R. Robinson, "The charge of the electron", Rep. Prog. Phys. 4, 212 (1937).
10.1088/0034-4885/4/1/312
4.803e-10   1.6021e-19   3e-23
Review

F. G. Dunnington, "The Atomic Constants A Revaluation and an Analysis of the Discrepancy", Rev. Mod. Phys. 11, 65 (1939).
10.1103/RevModPhys.11.65
4.8025e-10  1.60194e-19 1.3e-23
X-Ray

J. W. M. DuMond and E. R. Cohen, "Least-Squares Adjusted Values of the Atomic Constants as of December, 1950", Phys. Rev. 82, 555 (1951).
10.1103/PhysRev.82.555.3
4.80223e-10 1.60185e-19 2.3e-24
Review

E. R. Cohen and J. W. M. DuMond, "Our Knowledge of the Fundamental Constants of Physics and Chemistry in 1965", Rev. Mod. Phys. 37, 537 (1965).
10.1103/RevModPhys.37.537
4.80298e-10 1.60210e-19   7e-24
Review