I don’t have full stats for all my kindle-direct sales, but am surprised how steady the sales for the GA book have been
| Jan 1- March 31 2019 | April 1 – June 30, 2019 | June 4 – Sept 1, 2019 | |
Geometric Algebra for Electrical Engineers |
24 | 24 | 26 |
Statistical Mechanics |
3 | 2 | |
Relativistic Electrodynamics |
2 | ||
Classical Optics |
4 | ||
Quantum Field Theory |
2 | 2 | |
Condensed Matter |
1 | ||
Graduate Quantum Mechanics |
1 |
Some of the earlier sales were to family members who wanted copies, but the rest are legitimate.