The program allows you to perform a literature search on (currently) the following journals:
The Journal of the Oughtred Society (All volumes to Vol 28 No. 2 2019)
The Slide Rule Gazette (All volumes to Issue 18 Autumn 2018)
Skid Stick (All volumes to No. 64 January 2020)
Proceedings of the International Meeting of Slide Rule Collectors (With thanks to the UKSRC - All volumes to the 25th Meeting September 2019) There was no Volume 10 published - Volume 10 has been published in the form of the ARISTO book by Klaus Kuhn and Karl Kleine.
From Vols 12, 15, and 19 only the English articles are available.