On the Law of Distribution of Energy in the Normal Spectrum Updated 2024-12-15 +Created 1970-01-01
The Planck's law paper.
hermes.ffn.ub.es/luisnavarro/nuevo_maletin/Planck%20(1900),%20Distribution%20Law.pdf contains a replica of the translation present in The Old Quantum Theory by Dirk ter Haar (1967).