In the research of scientific and mathematical history, efficient skills in searching for and accessing old academic journals (preferably for free) are essential. However, even when using platforms like Internet Archive or Google Books, it's often difficult for me to find what I'm looking for, and even if I do find it, full-text access might not be available. Then, when I ask for help on this forum, someone always manages to find what I need. Is there some trick I'm unaware of?

For instance, right now I'm trying to find a pioneering paper from 1926 published in Germany titled "Winkelvariable und Kanonische Transformationen in der Undulationsmechanik," which applies Hilbert space theory to quantum mechanics. The bibliographic information is Zs. f. Phys., 40, 193-210 (1926), but I'm having trouble locating it.

By the way, I recently asked for help finding another paper by the same author in the preceding issue of the journal on this forum, and several people found it for me. Where does this difference in skill come from? Please, I'd like to know the trick.