75/2455 Tinbergen, j. Minimumproblemen in de Natuurkunde en de Ekonomie. Amst., H.J. Paris, 1929, 65p., orig. wr.

- Uncut copy; wr. sl. unevenly browned; trifle rubbed along extremities.

= Rare first trade edition. This important thesis introduced the use of mathematics in the science of economics.