 The author of a contribution was asked to choose a "Bestwert" (optimum value) from the mass of statements of an experimental value in the publications of different authors, or derive a "wahrscheinlichster Wert” (most possible value).The other change of importance was that not only diagrams became as important as tables, but that text also became necessary to explain the presented data.The New Series represents over 520 books published between 1961 and 2018 and includes more than 220,000 pages covering mechanical, optical, acoustical, thermal, spectroscopic, electrical and magnetic properties among others.